Warning! Spoilers ahead for Undead Unluck chapter 95!
Fans understandably can't stand anime filler episodes, but if Undead Unluck ever got adapted these annoying episodes could actually fix the biggest flaw in the manga.
Anime usually begin airing when mangakas are still writing the original manga that inspired the adaptations. Studios generally resort to fillers when the anime catches up to the manga so that the mangaka can write more chapters that will later be adapted into episodes. Fillers, however, are notoriously bad, especially in comparison to canon, and as a result, fans usually stop watching the show until the normal story captured in the original manga resumes. Ironically, Shonen Jump's current practice might make these fillers a necessity going forward as the manga anthology currently pressures mangaka to expedite their stories to capture readers' attention (sometimes through time jumps) because if the manga doesn't meet a certain threshold by a particular chapter, the anthology axes the series.
Related: Undead Unluck Just Became Shonen Jump's Most Tragic Series
Shonen Jump's business tactic undoubtedly affected mangaka Yoshifumi Tozuka when writing Undead Unluck. Interestingly, most series are cancelled around chapter 19, and that's when Tozuka incorporated a massive time jump to most likely keep readers on their toes (and prevent Shonen Jump from canceling his series). Before that pivotal installment, the manga basically followed the Union, a specific group of superpowered individuals known as Negators. The Union always met at a certain time to receive a mission from a terrifying sentient book aptly named Apocalypse. By chapter 19 of the manga, one of the main characters named Fuuko Izumo falls unconscious
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