In the world of Anime There are series that start with huge promises, adaptations that fans await for years or titles that come wrapped in controversy. But sadly, not everyone delivers what they promise. Some end up in disappointment, others become infamous for their narrative flaws, and there are cases that became memes of how bad or frustrating they were. Here we review 10 anime that, for better or for worse, every fan who saw them remembers with a little regret.
10. Lucifer and the Biscuit Hammer

The manga of Hoshi no Samidare It is considered a jewel of the genre, with an original script and an emotional development. But when the anime adaptation arrived in 2022, the disappointment was immediate: mediocre animation, hasty pace and scenes that seemed to be taken from a cheap generic anime. What could have been a classic became an example of how to ruin a beloved work.
9. Soul Eater

Many love the Gothic style and the unique aesthetic of soul eater, but fans don’t forget their ending. The anime deviated from the manga and ended with an improvised closure, in a hurry and without the depth it deserved. The worst thing is that the series was going incredibly well until then, which leaves the bitter feeling of “Is this really all?”
8. Midori: Shoujo Tsubaki

known simply as Midori, this cult film is remembered for its grotesque and disturbing tone. Based on an underground manga, the anime is so explicit and extreme that many wish they had never seen it. It is one of those titles that are recommended with giant warnings, because not everyone supports their crudeness.
7. Wonder Egg Priority

A bright, visually beautiful start with a risky proposal that caught the audience. But then everything fell apart. Production problems, an unfinished ending and a special episode that generated more doubts than answers made this anime one of the most painful cases of potential wastage.
6. Anime: Tokyo Ghoul

The first season fell in love with its dark atmosphere and charismatic characters, but the saga quickly turned into a disaster. Hasty adaptations, meaningless changes in the story and a script that jumped entire bows made many fans still hurt by remembering what could have been a legendary anime.
5. Anime: Uzumaki

The manga of Junji Ito It’s a horror masterpiece, but attempts to bring his work to anime have been chaos. Infinite delays, unfulfilled expectations, and the feeling that no study manages to capture the style of ITO have made that Uzumaki Be more remembered for your unsuccessful ads than for what has really been seen.
4. The Promised Neverland (Season 2)

The first season is considered one of the best modern adaptations of the Shonen. The second… well, better not to mention. They cut full arcs, summarized the story in a kind of “narrated powerpoint” and delivered one of the most infamous endings in years. Fans still ask for justice for this work.
3. Anime: Pupa

When it was announced, it sounded promising: terror, gore, psychological drama. But the anime ended up being a joke. With chapters of just 5 minutes, ridiculous censorship and cheap animation, pupa He went down in history as one of the worst adaptations ever made. So much so that many classify it as “the anime that should never have existed.”
2. Deadman Wonderland

The premise was brutal: an amusement park where prisoners fight to the death. And although the beginning promised quite a bit, the anime was left halfway, with an abrupt ending that left the story incomplete. The manga kept going, but the animated series remained a scar for those who invested their time in it.
1. One Piece (the first episodes)

one piece It is one of the largest and most influential animes in history. But even his most loyal fans admit that the animated adaptation is infamous in various ways: eternal rhythm, absurd fillings and an animation that for years was not up to the manga. It is an anime that everyone sees, but many regrets to continue week after week.
These animes are not necessarily “bad” in all aspects, but they did leave a bitter mark on the Otaku community. From wasted promises to ruined endings, each became a kind of warning of what can happen when the execution isn’t up to the idea.