An anthology comic of Onii-chan wa Oshimai! by various mangaka.
 
Volume 1 (2021-05-27) 
Cover Illustration: Namori 
Color Illustration: Yui Hara, Shiromanta, Bell Izumi 
1. 3-bai★Push! (3倍★プッシュ!) [Namori] 
2. Onii-chan wa Umitai!? (お兄ちゃんはうみたい!?) [Koume Fujichika] 
3. Mahiro to Minority (まひろとマイノリティ) [Natsu Tadano] 
4. Mahiro to Keika Kansatsu (まひろと経過観察) [Taku Kawamura] 
5. Himitsu no Hand Sign (秘密のハンドサイン) [Masakuni Igarashi] 
6. A letter for you [Waka Kakitsubata] 
7. Oyama Mahiro wo Kisekaetai! (緒山まひろを着せ替えたい!) [Norito Asazuki] 
8. Wasurerarenai Kanshoku (忘れられない感触) [Nekoume] 
9. Mahiro to Mahiri (まひろとまひり) [Tsuchii] 
10. Mahiro to Imaginary (まひろとイマジナリー) [Misaki Mori] 
11. Mahiro to Kyoufu no Misshitsu (まひろと恐怖の密室) [Kometsubu] 
12. Mihari to Aibou (みはりと相棒) [Shinichi Yuuki] 
13. Mahiro Love Letter (まひろラブレター) [Kina Kobayashi] 
14. Mahiro to Dankatsu (まひろと男活) [Suzu Yuuki] 
15. Mahiro to Kourei no Are (まひろと恒例のアレ) [Suka] 
 
Volume 2 (2022-04-27) 
Cover Illustration: bb Kuroda 
Color Illustration: Cool-kyou Shinja 
 
Volume 3 (2023-01-07) 
Cover Illustration: Yui Hara 
Color Illustration: bb Kuroda 
 
Volume 4 (2023-11-27) 
Cover Illustration: Hiroshi Hiroyama 
Color Illustration: Hori 
 
Volume 5 (2024-09-27) 
Cover Illustration: Ryou Imamura 
Color Illustration: Cherry Arai 
 
Volume 6 (2025-07-26) 
Cover Illustration: Muchimaro 
Color Illustration: Kouhei Shibata, Tsuchii, Ayase Totsuki 
 
Volume 7 (2026-05-27) 
Cover Illustration: Cool-kyou Shinja 
Color Illustration: Zurikishi

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.

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