Mag Talk Weekly Shonen Jump (2026) - News and Discussion!

[Shinuki no Reborn]

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~ Shinuki

I hope everyone reads the rules and use it as a guide to behave well in the thread, thanks!

 

[Shinuki no Reborn]

Weekly Shonen Jump Issue #50 (2026)
00. Akane-banashi (Cover & Lead Color Pages)
01. Sakamoto Days
02. One Piece
00. Ultimate Exorcist Kiyoshi (Color Page)
03. Someone Hertz
04. Ichi the Witch
05. Roku's House of Oddities
00. Shishikabane (One Shot by Maki Gyujirou, Color Page, Golden Future Cup #7)
06. Shinobi Undercover
07. The Ura Files
08. Witch Watch
09. Graykeith: Translator Daemonica
00. Me & Roboco (Color Page)
10. Nue's Exorcist
11. Under Doctor
12. Animal Signal
13. Class 2B Hero Destroyerz
14. Hal Formula
15. Kagurabachi
16. Cannon Master

Weekly Shonen Jump Issue #51 (2026) - Information!
Jean is in Danger! (New Series by Nakama Ryo, Cover & Lead Color Pages)
Witch Watch (Color Page, End)
Graykeith: Translator Daemonica (Color Page)
Shinobi Undercover (Color Page)

 

[tirakai]

To put it a bit simpler than that, the calculation is a simple line graph. For example #75 is halfway between #50 and #100, so the estimated sales would be exactly halfway between what #50 and #100 sold (we get the exact sales numbers for #30, #50, #100, and I think every further multiple of 50 until #500).

It's important to note series actually sell significantly more than these estimates. Shoseki only counts particular bookstore chains so a lot of the smaller local chains, online storefronts, etc. are not part of it, and of course digital sales are not included either.

As a result, you shouldn't treat it as how series are actually selling, rather it's a useful indicator of how series sell relative to other series and their own previous volumes.

--- Double Post Merged, Jan 17, 2026, Original Post Date: Jan 17, 2026 ---

For an example, Sakamoto Days recently is 150-200k per volume in Shoseki estimations, but as of vol 23 the series had 15 million copies in circulation, which is around 650k per volume.

Even assuming early volumes have more copies around, and that there's volumes sitting in stores unsold, the recent volumes' real sales numbers should still be least double the Shoseki numbers.

 

[defensor_de_boruto]

Well, vol 5 was when the Nue was still pulling nearly 30k in a month:

Nue's Exorcist #5 (29.738)

While vol 8 was exactly the volume that had that pretty weird drop from 30k to 24k

Nue's Exorcist #8 (24.668)

--- Double Post Merged, Jan 17, 2026, Original Post Date: Jan 17, 2026 ---

I'm terrible at explaining this lol

Pick Boruto #5 on 65th

You subtract the placement number with 100: 65 - 100 = 35

Pick the number of copies at the bottom of the top 500 ranking in question: http://shosekiranking.blog.fc2.com/blog-entry-5537.html

30位170850/50位130500/100位87200/200位54600/300位39800/400位31650/500位27300

Since the volume is at 65th, you pick the value from 50th (130.500) and subtract with the value of 100th (87.200): 130.500 - 87.200 = 43.300

Divide 43.300 with 50: 43.300 ÷ 50 = 866

Now multiply 866 with that number from the placement you got at first: 866 x 35 = 30.310

Now you add 30.310 to the value from the 100th: 30.310 + 87.200 = 117.510 Copies Sold

30位170850/50位130500/100位87200/200位54600/300位39800/400位31650/500位27300

Very important details:

-If a series its between 30th to 50th place, the placement subtraction is -50 not -100, for example, if the volume is on 40th, you will subtract 40 - 50 not 40 -100, from 50th place is subtracted by 100

-If a series it's between 30th to 50th place, the divide part explained above it's not divided by 100 but 20, if the series is placed between 50th to 100th, it's divided by 50, and from 100th to 500th its all divided by 100

These are very important to keep in mind because they directly influence the final number of copies, so a mistake will give you the wrong estimation.

With the explanation seems like a super confusing thing but i'm so used to it i do in seconds

Damn that was a great explanation, thanks

--- Double Post Merged, Jan 17, 2026 ---

-If a series its between 30th to 50th place, the placement subtraction is -50 not -100, for example, if the volume is on 40th, you will subtract 40 - 50 not 40 -100, from 50th place is subtracted by 100

and if a series is after 100th place, do you still subtract by 100?

 

[Shinuki no Reborn]

and if a series is after 100th place, do you still subtract by 100?

100, everything from 50th to 500th you subtract by 100

--- Double Post Merged, Jan 17, 2026, Original Post Date: Jan 17, 2026 ---

It's important to note series actually sell significantly more than these estimates. Shoseki only counts particular bookstore chains so a lot of the smaller local chains, online storefronts, etc. are not part of it, and of course digital sales are not included either.

As a result, you shouldn't treat it as how series are actually selling, rather it's a useful indicator of how series sell relative to other series and their own previous volumes.

It depends a lot, sometimes Shoseki estimations for X series are pretty spot on with the Oricon version, the difference being by some dozen copies, sometimes it's overestimated and sometimes underestimated.

 

[Shinuki no Reborn]

Sorry for taking long to open the January covers poll, please don't wait to vote

YOUR FAVORITE VOLUME COVERS FROM JANUARY 2026​

Akane-banashi Volume 20

Kagurabachi Volume 10

Hima-Ten! Volume 7

Shinobi Undercover Volume 6

Harukaze Mound Volume 2

Ekiden Bros Volume 2

Ping Pong Peril Volume 2

Jujutsu Kaisen Modulo Volume 1

Someone Hertz Volume 1

 

[Dippy Fresh]

Hideo Shinkai: Finished Soul Catcher(S), published "Shunkan Tantei Hirameki Hayao" for 2 volumes on Saikyo Jump and returned to WSJ with Earthchild

Kenta Shinohara: Finished Sket Dance, published Astra Lost in Space on Jump Plus and returned to WSJ with Witch Watch

Mitsutoshi Shimabukuro: Finished Seikimatsu Leader-den Takeshi, published "Ring" on Super Jump for 3 volumes and returned to WSJ with Toriko

Kentaro Yabuki: Finished To Love-ru, published Mayoi Neko Overrun & To Love-ru Darkness on JumpSQ, published Darling in the FranXX on Jump Plus and returned to WSJ with Ayakashi Triangle

Takeshi Obata: Finished Bakuman, published All You Need Is Kill on Young Jump for 2 volumes and returned to WSJ with Gakkyu Houtei

Nisio Isin: Finished Medaka Box, published like 50 other series in other magazine/publishers and returned to WSJ with Cipher Academy

It may have few other examples from older authors but i don't really remember other cases, once you leave Jump is almost certain you will not return.

Sorry, I should've been a lot more specific. I meant went to a different publisher all together. Like, I knew Shinohara went to Jump+ with Astra but that's still under the Shueisha umbrella. Sakano, for example, is under a different publisher all together. The only one I thought of and you mentioned was Nisioisin

 

[Reverseshin]

Jump is Offering Duplicate Mini Shikishi’s of the Shikishi’s from JF 2026

--- Double Post Merged, Jan 17, 2026, Original Post Date: Jan 17, 2026 ---

Spoiler: New One Piece Merchandise

--- Double Post Merged, Jan 17, 2026 ---

Spoiler: MHA New Official Art

 

[Nuesmoker]

Well, vol 5 was when the Nue was still pulling nearly 30k in a month:

Nue's Exorcist #5 (29.738)

While vol 8 was exactly the volume that had that pretty weird drop from 30k to 24k

Nue's Exorcist #8 (24.668)

I mean, yeah, that WAS my point: despite hanging in there in the rankings, the actual physical sales have dropped, this goes both for yearly AND monthly

 

[SharkBait]

Interested in Under Doctor, cool design and medical battle shounen is definitely something different, unless i forgot someone is the first medical/medicine battle shounen since Asklepios in 2008! 18 years later lol

Kento Amemiya is back and it definitely looks like a Kento Amemiya series lmao! But i'm look forward, his art is great and i'm sure @SharkBait will be the number 1 fan in the thread

Alien Headbutt i think is definitely not a battle shounen but either a comedy or contact sport series

Lol I'm so late but Shadow Eliminators called me and I'm so hyped for the new serious 🩷 please have a male best friend

 

[defensor_de_boruto]

100, everything from 50th to 500th you subtract by 100

so i definitely did something wrong, tried to calculate 475 which is sakamoto days but it did way more than what it shouldve lmao

but i tried applying the same with BB and it worked!!

 

[Shinuki no Reborn]

so i definitely did something wrong, tried to calculate 475 which is sakamoto days but it did way more than what it shouldve lmao

but i tried applying the same with BB and it worked!!

475. Sakamoto Days

500 - 475 = 25
(400位31650/500位27300) 31,650 - 27,300 = 4,350
4,350 ÷ 100 = 43,5
43,5 x 25 = 1,087
1,087 + 27,300 = 23,387

475. Sakamoto Days (23,387)

 

[NeeNeen]

I'm sure we've gotten some idea before, but this means they submit chapters 4 weeks in advance. Although Kawaguchi seems to have no trouble keeping up art wise so maybe he submits his work on the earlier side of the due date.

Wouldn't the holiday weeks have an effect on that though?

It's possible they need a bigger margin because the printing companies are closed, or something like that.

 

[Shinuki no Reborn]

Yearly Shoseki Top 500 (1/1/25 - 12/31/25)
1. One Piece #111
2. One Piece #112
3. One Piece #113
11. Jujutsu Kaisen #30
14. Jujutsu Kaisen #29
36. Blue Box #19 (270,015)
42. Sakamoto Days #20 (247,530)
43. Kagurabachi #6 (243,782)
44. Blue Box #20 (240,035)
47. One Piece #110 (228,792)
52. Kagurabachi #7 (214,760)
53. Sakamoto Days #21 (213,365)
55. Jujutsu Kaisen #28 (210,575)
59. Blue Box #21 (204,995)
63. My Hero Academia #42 (199,415)
66. Sakamoto Days #22 (195,230)
71. Kagurabachi #8 (188,255)
72. Kagurabachi #9 (186,860)
75. Ichi the Witch #1 (182,675)
76. Ruri Dragon #3 (181,280)
83. Blue Box #22 (171,515)
84. Sakamoto Days #23 (170,120)
97. Ichi the Witch #2 (151,985)
100. Sakamoto Days #24 (147,800)
122. Kimetsu no Yaiba #23 (138,274)
128. Ichi the Witch #3 (135,676)
132. Kimetsu no Yaiba #22 (133,944)
137. Jujutsu Kaisen #27 (131,779)
142. Blue Box #23 (129,614)
143. Kimetsu no Yaiba #19 (129,181)
145. Kimetsu no Yaiba #20 (128,315)
156. Kimetsu no Yaiba #21 (123,552)
169. Kimetsu no Yaiba #18 (117,923)
174. Sakamoto Days #25 (115,758)
175. Ichi the Witch #4 (115,325)
180. Ruri Dragon #4 (113,160)
181. Blue Box #18 (112,727)
183. Sakamoto Days #1 (111,861)
190. Black Clover #37 (108,830)
211. Ichi the Witch #5 (101,277)
225. Jujutsu Kaisen #26 (97,175)
226. One Piece #109 (96,882)
228. Kagurabachi #1 (96,296)
229. Sakamoto Days #2 (96,003)
231. Sakamoto Days #19 (95,417)
239. Kimetsu no Yaiba #17 (93,073)
250. Kagurabachi #5 (89,850)
258. Sakamoto Days #3 (87,506)
261. Ichi the Witch #6 (86,627)
266. Sakamoto Days #6 (85,162)
267. Sakamoto Days #5 (84,869)
274. Sakamoto Days #4 (82,818)
275. My Hero Academia #41 (82,525)
280. Sakamoto Days #18 (81,060)
283. Blue Box #17 (80,181)
284. Kagurabachi #2 (79,888)
285. Sakamoto Days #10 (79,595)
287. Sakamoto Days #7 (79,009)
289. Sakamoto Days #9 (78,423)
297. Sakamoto Days #8 (76,079)
300. Sakamoto Days #17 (75,200)
305. Sakamoto Days #11 (74,650)
311. Sakamoto Days #13 (73,990)
316. Blue Box #16 (73,440)
318. Sakamoto Days #12 (73,220)
320. Kagurabachi #4 (73,000)
321. Kagurabachi #3 (72,890)
325. Sakamoto Days #14 (72,450)
326. Sakamoto Days #15 (72,340)
327. Sakamoto Days #16 (72,230)
329. Blue Box #12 (72,010)
331. Blue Box #15 (71,790)
335. Kimetsu no Yaiba #1 (71,350)
342. Jujutsu Kaisen #25 (70,580)
344. The Elusive Samurai #19 (70,360)
352. Blue Box #14 (69,480)
355. Mission: Yozakura Family #29 (69,150)
358. Blue Box #13 (68,820)
362. Blue Box #11 (68,380)
364. Kimetsu no Yaiba #16 (68,160)
367. Blue Box #10 (67,830)
379. Mission: Yozakura Family #28 (66,510)
387. Blue Box #1 (65,630)
416. The Elusive Samurai #20 (62,728)
433. Blue Box #9 (61,164)
443. One Piece #108 (60,244)
446. Blue Box #2 (59,968)
454. The Elusive Samurai #21 (59,232)
455. Witch Watch #20 (59,140)
463. Hunter x Hunter #38 (58,404)
464. Kimetsu no Yaiba #2 (58,312)
470. My Hero Academia #40 (57,760)
476. Blue Box #3 (57,208)
482. Jujutsu Kaisen #24 (56,656)
486. Blue Box #8 (56,288)
490. Witch Watch #21 (55,920)
494. Blue Box #6 (55,552)
498. Blue Box #4 (55,184)
499. Blue Box #7 (55,092)
-----

ONE PIECE

One Piece #111
One Piece #112
One Piece #113
One Piece #110 (228,792)
One Piece #109 (96,882)
One Piece #108 (60,244)


HUNTER X HUNTER

Hunter x Hunter #38 (58,404)


MY HERO ACADEMIA

My Hero Academia #42 (199,415)
My Hero Academia #41 (82,525)
My Hero Academia #40 (57,760)


BLACK CLOVER

Black Clover #37 (108,830)


KIMETSU NO YAIBA

Kimetsu no Yaiba #23 (138,274)
Kimetsu no Yaiba #22 (133,944)
Kimetsu no Yaiba #19 (129,181)
Kimetsu no Yaiba #20 (128,315)
Kimetsu no Yaiba #21 (123,552)
Kimetsu no Yaiba #18 (117,923)
Kimetsu no Yaiba #17 (93,073)
Kimetsu no Yaiba #1 (71,350)
Kimetsu no Yaiba #16 (68,160)
Kimetsu no Yaiba #2 (58,312)


JUJUTSU KAISEN

Jujutsu Kaisen #30
Jujutsu Kaisen #29
Jujutsu Kaisen #28 (210,575)
Jujutsu Kaisen #27 (131,779)
Jujutsu Kaisen #26 (97,175)
Jujutsu Kaisen #25 (70,580)
Jujutsu Kaisen #24 (56,656)


MISSION: YOZAKURA FAMILY

Mission: Yozakura Family #29 (69,150)
Mission: Yozakura Family #28 (66,510)


SAKAMOTO DAYS

Sakamoto Days #20 (247,530)
Sakamoto Days #21 (213,365)
Sakamoto Days #22 (195,230)
Sakamoto Days #23 (170,120)
Sakamoto Days #24 (147,800)
Sakamoto Days #25 (115,758)
Sakamoto Days #1 (111,861)
Sakamoto Days #2 (96,003)
Sakamoto Days #19 (95,417)
Sakamoto Days #3 (87,506)
Sakamoto Days #6 (85,162)
Sakamoto Days #5 (84,869)
Sakamoto Days #4 (82,818)
Sakamoto Days #18 (81,060)
Sakamoto Days #10 (79,595)
Sakamoto Days #7 (79,009)
Sakamoto Days #9 (78,423)
Sakamoto Days #8 (76,079)
Sakamoto Days #17 (75,200)
Sakamoto Days #11 (74,650)
Sakamoto Days #13 (73,990)
Sakamoto Days #14 (72,450)
Sakamoto Days #15 (72,340)
Sakamoto Days #16 (72,230)
Sakamoto Days #12 (73,220)


THE ELUSIVE SAMURAI

The Elusive Samurai #19 (70,360)
The Elusive Samurai #20 (62,728)
The Elusive Samurai #21 (59,232)


WITCH WATCH

Witch Watch #20 (59,140)
Witch Watch #21 (55,920)


BLUE BOX

Blue Box #19 (270,015)
Blue Box #20 (240,035)
Blue Box #21 (204,995)
Blue Box #22 (171,515)
Blue Box #23 (129,614)
Blue Box #18 (112,727)
Blue Box #17 (80,181)
Blue Box #16 (73,440)
Blue Box #12 (72,010)
Blue Box #15 (71,790)
Blue Box #14 (69,480)
Blue Box #13 (68,820)
Blue Box #11 (68,380)
Blue Box #10 (67,830)
Blue Box #1 (65,630)
Blue Box #9 (61,164)
Blue Box #2 (59,968)
Blue Box #3 (57,208)
Blue Box #8 (56,288)
Blue Box #6 (55,552)
Blue Box #4 (55,184)
Blue Box #7 (55,092)


RURI DRAGON

Ruri Dragon #3 (181,280)
Ruri Dragon #4 (113,160)


KAGURABACHI

Kagurabachi #6 (243,782)
Kagurabachi #7 (214,760)
Kagurabachi #8 (188,255)
Kagurabachi #9 (186,860)
Kagurabachi #1 (96,296)
Kagurabachi #5 (89,850)
Kagurabachi #2 (79,888)
Kagurabachi #4 (73,000)
Kagurabachi #3 (72,890)


ICHI T HE WITCH

Ichi the Witch #1 (182,675)
Ichi the Witch #2 (151,985)
Ichi the Witch #3 (135,676)
Ichi the Witch #4 (115,325)
Ichi the Witch #5 (101,277)
Ichi the Witch #6 (86,627)

 

[Wookitake]

Where do you get those sales numbers @Shinuki no Reborn?

Do we have any more Intel on SH's success on Japan? Posts, etc. Do the puns really work? We all know that it's kind of lame when translated, I suppose the original was good, but it seems it is really really funny.

Maybe it's just the tism exhaling from Kurage.

 

[Shinuki no Reborn]

Where do you get those sales numbers @Shinuki no Reborn?

Do we have any more Intel on SH's success on Japan? Posts, etc. Do the puns really work? We all know that it's kind of lame when translated, I suppose the original was good, but it seems it is really really funny.

Maybe it's just the tism exhaling from Kurage.

Already explained for Defensor in the last page.

I'm terrible at explaining this lol

Pick Boruto #5 on 65th

You subtract the placement number with 100: 65 - 100 = 35

Pick the number of copies at the bottom of the top 500 ranking in question: http://shosekiranking.blog.fc2.com/blog-entry-5537.html

30位170850/50位130500/100位87200/200位54600/300位39800/400位31650/500位27300

Since the volume is at 65th, you pick the value from 50th (130.500) and subtract with the value of 100th (87.200): 130.500 - 87.200 = 43.300

Divide 43.300 with 50: 43.300 ÷ 50 = 866

Now multiply 866 with that number from the placement you got at first: 866 x 35 = 30.310

Now you add 30.310 to the value from the 100th: 30.310 + 87.200 = 117.510 Copies Sold

30位170850/50位130500/100位87200/200位54600/300位39800/400位31650/500位27300

Very important details:

-If a series its between 30th to 50th place, the placement subtraction is -50 not -100, for example, if the volume is on 40th, you will subtract 40 - 50 not 40 -100, from 50th place is subtracted by 100

-If a series it's between 30th to 50th place, the divide part explained above it's not divided by 100 but 20, if the series is placed between 50th to 100th, it's divided by 50, and from 100th to 500th its all divided by 100

These are very important to keep in mind because they directly influence the final number of copies, so a mistake will give you the wrong estimation.

With the explanation seems like a super confusing thing but i'm so used to it i do in seconds

Short answer, the overall sale numbers are given by Shoseki at the bottom of the page in every weekly/monthly/yearly Top 500 rankings and you have to do the math to get the exact number of copies for each volume.

Do we have any more Intel on SH's success on Japan? Posts, etc. Do the puns really work? We all know that it's kind of lame when translated, I suppose the original was good, but it seems it is really really funny.

Maybe it's just the tism exhaling from Kurage.

It's pretty big popular online specially on Twitter, fanarts left and right. And yeah, the jokes and pop culture references totally work because it's literally made for the japanese public.

 

[Wookitake]

Why the fuck do they post these number with such a complex system? Why don't they just publish the full numbers like normal people? Holy shit.

Also: do you know for sure that this is the right method? Because from that page (rough translation), I got that the number of *total* sales from all the volumes between 50 and 100 (those 50 volumes) was 43.300. Not from each of the 50 volumes, but the total from summing the sales from #50 to #100.

And thanks for the SH heads up too!

 

[tirakai]

Shoseki doesn't post the numbers with that system in mind, they're just posting a daily/weekly/monthly ranking with a few specific sales numbers listed for a general reference. The calculation is something fans have created to get a rough estimate for each volume on the chart.

I'll say again but it's really not something to take that seriously since we don't know digital sales or sales from amazon and small bookstores not linked to Shoseki, etc. It's a ranking, a way to compare things, not the actual overall sales numbers which are much higher.

 

[Shinuki no Reborn]

Why the fuck do they post these number with such a complex system? Why don't they just publish the full numbers like normal people? Holy shit.

Also: do you know for sure that this is the right method? Because from that page (rough translation), I got that the number of *total* sales from all the volumes between 50 and 100 (those 50 volumes) was 43.300. Not from each of the 50 volumes, but the total from summing the sales from #50 to #100.

And thanks for the SH heads up too!

Yeah, that's the righ math, is complicated in theory but when you get used you do in seconds.

And lol you got it totally wrong , the numbers in the 50th and 100th represent the minimum and maximun of what each series between these placements might have sold with the series at 50th place and 100th having sold these exact numbers, when you apply the math you can get the exact estimative of sales.

 

[Hawke]

Hideo Shinkai: Finished Soul Catcher(S), published "Shunkan Tantei Hirameki Hayao" for 2 volumes on Saikyo Jump and returned to WSJ with Earthchild

Kenta Shinohara: Finished Sket Dance, published Astra Lost in Space on Jump Plus and returned to WSJ with Witch Watch

Mitsutoshi Shimabukuro: Finished Seikimatsu Leader-den Takeshi, published "Ring" on Super Jump for 3 volumes and returned to WSJ with Toriko

Kentaro Yabuki: Finished To Love-ru, published Mayoi Neko Overrun & To Love-ru Darkness on JumpSQ, published Darling in the FranXX on Jump Plus and returned to WSJ with Ayakashi Triangle

Takeshi Obata: Finished Bakuman, published All You Need Is Kill on Young Jump for 2 volumes and returned to WSJ with Gakkyu Houtei

Nisio Isin: Finished Medaka Box, published like 50 other series in other magazine/publishers and returned to WSJ with Cipher Academy

It may have few other examples from older authors but i don't really remember other cases, once you leave Jump is almost certain you will not return.

lmao, don't think I'd call most if any of them failures — especially not Shinohara who's going to end up as the only one here with two fully finished series in the magazine that maintained consistent quality and a good serialization run compared to the rest (Obata not withstanding, because Death Note and Bakuman but we're giving him a 2-1 record here so some points taken off)

Either way, highly doubt I'd call this list failures in any capacity lol

 

[Shinuki no Reborn]

lmao, don't think I'd call most if any of them failures — especially not Shinohara who's going to end up as the only one here with two fully finished series in the magazine that maintained consistent quality and a good serialization run compared to the rest (Obata not withstanding, because Death Note and Bakuman but we're giving him a 2-1 record here so some points taken off)

Either way, highly doubt I'd call this list failures in any capacity lol

I'm not saying any of these were failures, just pointing out the authors who changed magazine and came back to Jump later.

 

[Wookitake]

Yeah, that's the righ math, is complicated in theory but when you get used you do in seconds.

And lol you got it totally wrong , the numbers in the 50th and 100th represent the minimum and maximun of what each series between these placements might have sold with the series at 50th place and 100th having sold these exact numbers, when you apply the math you can get the exact estimative of sales.

Oh, OK, so that's what those numbers mean. Perfect. But anyway, I was trying to understand the meaning of the calculation. The math is simple, the point is why this math. It is just a simple uniform distribution of sales. Here's the reasoning:

Spoiler

1) Subtracting the placement with the "next category" gives you how many places you need to "go down" to get to that placement (the 100-65 for Boruto). Let's call this Np

2) Subtracting the sales of the 50th and the 100th gives you how much the total sales goes up from 100 to 50. Let's call this DR

3) Crucial step: dividing this value by the amount of series between this rankings (calling this amount N, like the 100-50 in the example) means that you are supposing that the distribution of sales is uniform.

In other words, it means that you suppose that from the #100 onwards the series sells S_i = Np * DR/N + S_100. That is just a linear fit.

If your series is #99, the sales S_99 = 1*866+87.200. If it is #65, then it's the computation you do.

As I said, the math is pretty simple. However, I'd prefer a more nuanced approach than a uniform distribution of sales across these categories.

A good first step is to fit the number of sales (30位170850/50位130500/100位87200/200位54600/300位39800/400位31650/500位27300) to a simple power-law function (using scipy's curve_fit)

The result as a function of ranking: Sales(ranking) = 1.432.271 + ranking^(-0.6195).

The differences in comparison to a linear fit between "categories" are not that large, but I find the fitting approach more precise. It can even give us an error estimate. For Boruto, for example, the sales numbers would be S_65 = 107882.94 (+ 19651.8) (-17259.7) (max = 127534, min = 90623).

I'd rather fit the probability of some series to sell a X amount to some kind of Poisson or Normal distribution. Also, since we have more data, we could try to use it all (even though the total number of sales probably changes from year to year, in particular for those years with great outliers like those KnY sales). I'll leave this for later.