Guessing it's first 1-10 weeks, sites like VGChartz with close numbers + more platforms info
[PC/NSW/PS4/XBO] Dragon Ball FighterZ - 3,500,000 / Update Oct 2018
[NSW/PS4/XBO] My Hero: One's Justice - 344,229 / First 10 weeks, XBO 8 weeks, PC (via steamspy) 20,000-50,000
[PS4/XBO] Naruto to Boruto: Shinobi Striker - 278,994 / First 10 weeks, PC (via steamspy) 50,000-100,000
[PS4] Fist of the North Star: Lost Paradise - 174,785 / First 10 weeks
[PS4/PSV] Gintama Ranbu - 82,608 / First 10 weeks
[PS4] Black Clover: Quartet Knights - 27,335 / First 10 weeks, PC (via steamspy) 0-20,000
[PS4] Yuuna and the Haunted Hot Springs: Steam Dungeon - 7,311 / First 5 weeks
Gintama 100% passed the 100K mark since it's getting re-release next month, which is common for high sellers.
Aside from DBZF and PC ports, it's sales in Japan.