...Okay, a little off topic, but Slime is huge. It made more money than everything bar One Piece and Kimetsu. No fucking wonder they're going all in with the anime's second season and spinoffs. This bodes well for a full adaptation.
Back to Jump:
About 45.5% of HeroAca's sales were backlogs, divided between 25 volumes.
About 51.5% of Neverland's sales were backlogs, divided between 17 volumes.
About 50.26% of Haikyuu!!'s sales were backlogs, divided between 41 volumes.
Considering these three series more or less pull similar numbers and are one of the biggest series currently running, Neverland's boost is remarkable. It's a shame that Kimetsu completely overshadowed it. But lest we not forget about one other impressive manga...
SPY x FAMILY. When the fuck is Volume 4 coming out, cause I need to see this fucking growth. Over 200k in just three volumes entirely from backlogs is nothing short of absolutely amazing. Endo really found major success after so long.