In Japanese comment forums and social media, a heated debate has been generated about anime that, in the opinion of many, “They were good until the penultimate episode, but they got ruined with the ending.“. The question “Animes that were good until the penultimate episode, but failed miserably in the end?” generated an avalanche of opinions and discussions among fans.

Several factors can contribute to an anime series' ending not meeting its audience's expectations. Among them:

• Incongruity in the narrative: An ending that doesn't align with the story's previous development can result in a frustrating experience for viewers. This includes rushed resolutions or resolutions that don't respect the internal logic of the world created by the series.
• Poor character development: Characters are the heart of any story. If their narrative arcs don't have a proper conclusion, or if their actions at the end don't match their previous development, fans may feel betrayed.
• Unmet expectationsThroughout anime, viewers form expectations based on plots and subplots. An ending that ignores these expectations or offers an unexpected but poorly executed twist can be very disappointing.
• Production problems: Sometimes, production issues, such as lack of budget, time, or resources, can negatively impact the quality of the final episode. This can result in subpar animation or rushed, poorly planned storytelling.
• Changes in creative direction: If the direction of the anime changes late in production, it can lead to creative decisions that are not aligned with the initial vision, creating dissonance and confusion by the end of the series.

A fitting ending can cement an anime's reputation and leave a lasting impression on viewers. On the contrary, a bad ending can overshadow even the most positive aspects of the series. The conclusion of a story is crucial to making sense of everything that came before and providing a sense of closure and satisfaction to viewers.

• «Hibike! Euphonium».
• «Female band cries».
• «Kamisama ni Natta Hi».
• «Haganai Season 2: I Don't Have Many Friends».
• «Recently, Astro Note. It's a mystery to me why the production raised expectations so much.».
• «I would say Mobile Suit Gundam: The Witch from Mercury and Mobile Suit Gundam: Iron-Blooded Orphans».
• «Wonder Egg Priority is really trash. And also Girls Band Cry».
• «Yuki Yuna is a heroine, without a doubt».
• «I didn't see the end of Hibike! Eufônio, but is it really that bad?».
• «The original Evangelion series was heavily criticized on the 2chan forums at the time.».
• «Higurashi no Naku Koro ni Sotsu».
• «The second season of Haganai: I Don't Have Many Friends ended assuming there would be a third season, and it still ended with season 2, which is inexcusable. Personally, the ending of Masamune-kun season 1».
• «Wonder Egg Priority, Back Arrow, Shuumatsu no Izetta».
• «Girls Band Cry was also very bad. It's a series that's only valid up to episode 11.».
• «Charlotte, Kamisama and Natta Hi, Angel Beats!».
• «Granbelm, Egao no Daika (The Price of Smiles), Regalia: The Three Sacred Stars».
• «Angel Beats! It's not bad at the end, just the part before the end is bad, right? Although he was ridiculed, they eventually met in the afterlife.».
• «Guilty Crown».
• «“Angel Beats! It’s trash”, I thought it was the opposite opinion, but after seeing it… It really was trash».
• «AnoHana made me think, if they could do this, why didn't they do it from the beginning?».
• «The iDOLM@STER Cinderella Girls was also very bad. Although the whole series was bad overall».
• «Mobile Suit Gundam SEED Destiny».
• «I hope this season's Isekai Suicide Squad series doesn't fail.».
• «I can't remember the ending of Space☆Dandy. I just remember that it wasn't a good story.».
• «Chainsaw Man was a total failure».
• «I can't think of anything other than Evangelion».
• «The Chainsaw Man anime didn't have a bad ending, but overall it was disappointing.».
• «What bothers me the most is the kind of anime that seems promising but never gets interesting and the ending is bad.».
• «Granbelm is a trash anime that parodied Z Gundam and failed».
• «SSSS.GRIDMAN, although they managed to solve it in GRIDMAN UNIVERSE».
• «16bit Sensation is an example of a series that started to falter after episode 9, but recovered somewhat in the second half of the finale. Until episode 7, it was definitely a masterpiece.».
• «Episode 13 of BanG Dream! It's MyGO!!!!! It was completely unnecessary.».
• «The ending of Code Geass is legendary abroad».
• «Flamenco Samurai. Halfway through, the screenwriter seemed to have gone mad.».
• «In older anime, you'll find everything. Usually, Gundam, Macross, Evangelion, Ghost in the Shell, Cowboy Bebop. Quality anime like the films Sword of the Stranger, Paprika, and Satoshi Kon. That's the idea.».

Source: Yaraon!