1 - 20 of 31 Works in Ouka Asahi
Navigation
Listing Works
-
The Oyama Project by JackFu
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga), ONIMAI: I'm Now Your Sister, Onimai - Fandom
01 Jan 2026
Tags
Summary
Two versions of Mahiro Oyama from different universes switch places. Now they must navigate unfamiliar landscapes and unexpected changes, all while trying to find a way to return home.
As of 6/18/2025, the story has entered it's final saga:
Both Mahiros have faced numerous obstacles during their experiences living each others' lives. Although they have been able to adjust for the most part, they are about to face their most difficult challenges yet in their quest to return home. In less than two days time, Kun Mahiro will be forced to take the same test that Kun Mihari originally took in order to skip ahead straight to college. Failure would mean that her counterpart would forever lose out on an amazing opportunity, but can she really rise to the challenge. And even if she can, what does it mean about the kind of person that she's become thanks to the experiment. Meanwhile, Kun Mihari has become concerned by Chan Mahiro's behavioral backsliding which resembles the old antics of the shut-in brother whose body she's now inhabiting. Just how far is she willing to go in order to prevent history from repeating itself? One thing is clear, things are only going to get even more crazy from here.
-
Onimai! Highschool era by FalseMimicry
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), ONIMAI:
03 Dec 2025
Tags
Summary
after 3 years of being a girl with seemingly no sign of changing back, Mahiro is about to be entering Highschool, but this time as a girl, except who they are right now doesn't exist. Momiji is also grasping with new feelings that Mahiro causes her to feel, will she figure it out?
-
Minato wa Komatteiru! - Minato is in trouble! by Vixy72
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga), ONIMAI: I'm Now Your Sister
24 Nov 2025
Tags
Summary
Kanata has a habit of dressing her brother Minato in her clothes, and sending him to events she'd rather skip. Minato always plays along - maybe too willingly.
He says it is "just a favour for his sister". It doesn't mean anything.
Then he woke up with boobs.
Now things are complicated.A chaotic yet emotional comedy that dives into gender dysphoria, gender euphoria and self discovery - with a side of denial and sibling dynamics.
-
Complete obsession by FalseMimicry
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)
23 Nov 2025
Tags
Summary
the group is in highschool now and Momiji is going batshit insane over Mahiro with someone confessing to her, wanting to keep her all to herself. doing drastic and deranged things to get there
-
OniMai: Starting Over in a Broken Body by Not_Slumz
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)
10 Nov 2025
Tags
Summary
Mahiro Oyama was once brilliant athletic, admired, destined for greatness. Tuberculosis stole his future, leaving him bedridden for years. By the time he was twenty, he was nothing but a shut-in, drowning in games, studies, and self-hatred.
His sister Mihari refused to watch him waste away. With one reckless experiment, she erased his broken body and gave him a second chance. A chance to be reborn as a twelve-year-old girl.
But Mahiro doesn’t see it as a gift. Trapped in a child’s body, disgusted by her reflection, she struggles to confront the same question every day:
“If I hate myself… how can I ever change?”
This is the story of Mahiro Oyama—not of the boy who lost everything, but of the girl who must learn how to live again.
-
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
Tags
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.
-
Mahiro's Big Day by awiltedlily
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)
17 Sep 2025
Tags
Summary
It’s almost her birthday. Oyama Mahiro is turning 15. And she is struck with the realization that it has been over 3 years since she took the medicine for the first time. Memories that were once clear as day have started to slowly muddle as she settles into this life, he is about to enter high school soon, after all.
On a different page, Hozuki Momiji tries to prepare a present.
And finally, they celebrate her birthday.
-
Mahiro and Magical Girls by MollieWA
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)
24 Aug 2025
Tags
Summary
Momiji has been looping for a while and she ends up on a timeline that... might be too good to be true
Series
- Part 1 of Onimai Madoka Au
-
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
Tags
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.
-
Correct Onimai!: Short Stories by MollieWA
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)
20 Aug 2025
Tags
Summary
A compilation of short stories based on the Onimai Manga.
They are all isolated stories unless implied otherwise.
New tittle! -
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
Tags
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? -
Oyama Mahiro Meets Another Test Subject 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)
25 May 2025
Tags
Summary
It's almost Mahiro's birthday and she really wants a cat! Luckily for her (and unluckily for Mihari), a recent unexpected success at the lab might just help.
-
Tags
Summary
When a cold counters the effects of medicine, changing Mahiro back to normal, his friends have a chance to meet Mahiro-chan's big brother for the first time, and Momiji notices some odd and disturbing signs that all may not be as it seems in the Oyama household.
-
Tags
Summary
As Miyo and Asahi are out enjoying their Saturday, they spot something unexpected: Nayuta walking about with some older man. Is she on a date?!
Meanwhile, Nayuta is thankful to Mahiro for helping her buy a present for her sister, and the two hang out for a while, oblivious to their friends following and observing them.
-
A Wish against a vibrant life by MollieWA
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), Mahou Shoujo Madoka Magika | Puella Magi Madoka Magica
17 Apr 2025
Tags
Summary
Onimai but instead of a magical drug Mahiro needs to make a contract to become girl™ it doesn't go well but don't worry! Momiji can go back in time, what could possibly go wrong!
or basically i fused my Onimai and my Madoka brainrot and made this, free will is real people
-
Onimai Mahiro's Secret Revealed Volume 0.5 Doujinshi by ChrisGuardianPlayz
Fandoms: Gender Bender DNA Twister Extreme (Video Game)
15 Apr 2025
Tags
Summary
How Kaede Found Out About Mahiro's Secret During The Hot Springs Trip
- Language:
- English
- Words:
- 1,299
- Chapters:
- 1/1
- Kudos:
- 3
- Hits:
- 79
-
Onimai Mahiro's Secret Revealed Volume 1 by ChrisGuardianPlayz
Fandoms: Gender Bender DNA Twister Extreme (Video Game)
15 Apr 2025
Tags
Summary
One Simple Mistake From Mihari Is About To Change Mahiro's Life After Kaede Found Out About Mahiro's Secret She Promised To Keep It A Secret And Protect Him But Mihari Accidentally Called Mahiro Onii-Chan At A Sleepover Surprising His Friends Causing Them To Be Confused And Outraged How Will Mahiro's Life Go Now And Will His Friends Momiji Asahi And Miyo Forgive Him?
- Language:
- English
- Words:
- 4,309
- Chapters:
- 1/1
- Kudos:
- 2
- Hits:
- 71
-
Tags
Summary
A break-in occurs at Chitose's lab. Worried that the culprits are after a certain medicine, Chitose wants Mahiro brought to her right away for protection. Unfortunately, Mahiro is far away on a class fieldtrip.
-
Tags
Summary
Mahiro wakes up one morning to find that his guy and girl personas have split into two beings! How could this have happened, and what does this mean for his life going forward?
-
Onimai: Mahiro's Wettings and Consequences by TickingRat
Fandoms: お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Anime), お兄ちゃんはおしまい! | Oniichan wa Oshimai! (Manga), Onimai: I'm Now Your Sister!
25 Mar 2025
Tags
Summary
Mahiro's accidents are finally catching up to her, and soon she will have to deal with the consequences of her childish issues.
Series