Mahiro's little sister. A genius scientist that skipped grades and is now attending college. She is responsible for drugging Mahiro, turning him into a young girl.

Mahiro Oyama was just a normal erotic-game loving dude…until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing’s for sure…life is going to get a whole lot weirder from here on out! 
 
(Source: Kodansha USA)

__Height:__ 153cm

[Profile (Style Cube)](http://stylecube.jp/talents/kaori/index.html) | [Website](http://ishiharakaori.com/) | [Twitter](https://twitter.com/kaori_staff_) | [Blog](http://ameblo.jp/ishiharakaori/) | [Instagram](https://www.instagram.com/ishiharakaori_official) | [TikTok](https://www.tiktok.com/@kaori_ishihara)

She won the award of Best Rookie Actress in the 7th Seiyuu Awards. She was a founding member of the group [StylipS](https://anilist.co/staff/111177), before her graduation from the group on April 20, 2013. She was one half of J-Pop duo [YuiKaori](https://anilist.co/staff/195974/), along with [Yui Ogura](https://anilist.co/staff/105981/) before the group disbanded in 2017.

__Non-anime roles:__
- Frima - Goddess of Victory: Nikke (VG)
- Soldier EG - Goddess of Victory: Nikke (VG)
- Tiara - Fairy Fencer F (VG)

[Profile](http://www.power-rise.jp/saitou_yoshie.html) | [Twitter](https://twitter.com/saitoyoshie) | [Tsukino Kiiro Twitter](https://twitter.com/tsukino_kiiro)

She is affiliated with Power Rise.

Mahiro Oyama was just a normal erotic-game loving dude…until he woke up one morning as a woman! Turns out his mad-scientist little sister, Mihari, tried out one of her new experiments on him…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study him as he is determined to go back to his shut-in, game-playing life, and one thing’s for sure…life is going to get a whole lot weirder from here on out!
 
(Source: Kodansha USA)
 
Note: Includes 57 extra chapters.

An anthology comic of Onii-chan wa Oshimai! by various mangaka.

Specials chapters of Onii-chan wa Oshimai! bundled with the mini dramas CD sold during Comic Market.

Includes: 
1) まひろちゃんお誕生日会場 (2022 March 6) 
2) みはりちゃんお誕生日会場 (2022 April 22) 
3) あさひお誕生日会場 (2022 May 5) 
4) みよちゃんお誕生日会場 (2022 June 18) 
5) かえでちゃんお誕生日会場 (2022 September 12) 
6) もみじお誕生日会場 (2022 October 20) 
7) なゆたんお誕生日会場 (2022 November 23) 
8) まひろちゃんお誕生日会場 2023 (2023 March 6) 
9) みはりちゃんお誕生日会場2023 (2023 April 22)

A booklet bundled with the Onii-chan wa Oshimai! volume 7 special edition.

Special manga drawn for the Blu-Ray release of the anime Onii-chan wa Oshimai!.

Mihari Oyama