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Onimai: Back To The Past by Anonymous
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga)
24 Oct 2025
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Summary
Mahiro's finally started their third year of Junior High. Everything's going pretty well until a visit to Chitose's labratory ends with Mahiro stumbling back into the past. Surely, this'll only end well for them.
- Language:
- English
- Words:
- 16,007
- Chapters:
- 3/?
- Collections:
- 1
- Comments:
- 25
- Kudos:
- 70
- Bookmarks:
- 9
- Hits:
- 1,550
Bookmarked by phumgum
15 May 2026
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Onii-chan is Completely Done For! by Raineh_Daze
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga)
01 Apr 2025
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Summary
After several long years, it's finally time for high school, and Mahiro's eager to make sure it goes better than the first time around. There's just a few things that are a bit annoying, like all the attention Momiji is getting, and now it seems like the transformation drug isn't wearing off as often as it used to…? Well, it'll be fine in the end, right?
Bookmarked by phumgum
13 May 2026
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Am I Really Done For!? by Puenktchen
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga), Onimai - Fandom, ONIMAI: I'm Now Your Sister
01 Aug 2025
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Summary
Mihari can be proud! Her brother has finally found his way back to life. But how will the project be completed? Her senpai has a suitable idea.
But the bottle with the permanent variation of the drug is no longer with Mihari!
All she can do is pray that no one drinks from it by mistake.Inspired by Minato-kun is Done For?, this story shows what it's like to wake up one day as a girl and have an ex-boy as a mentor in womanhood.
But who has to learn from whom?Bookmarked by phumgum
12 May 2026
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The Trials and Tribulations of Mahiro Oyama by ryuko199
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga), ONIMAI: I'm Now Your Sister, Onimai - Fandom
21 Aug 2025
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Summary
It's the last year of middle school, high school entrance exams loom on the horizon... and a new problem has emerged! Specifically, Mahiro's lack of legal documentation. Unlike in middle school, Mihari and Chitose don't have the connections needed to get Mahiro into the entrance exams for the high school without proper ID. While nobody's happy when this fact is discovered, Mahiro least of all perhaps, it does provide a certain someone with the motivation to overcome their fears and step out of their comfort zone.
Bookmarked by phumgum
10 May 2026
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Blooming Under Water Hot and Cold by mayama_wawah
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga), お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Anime)
04 Jul 2025
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Summary
Mahiro has a strange dream where she doesn't feel like herself.
This, alongside revelations about a friend, leads her down a path of questioning and denial.Bookmarked by phumgum
10 May 2026