Onii-chan wa Oshimai!: Koushiki Anthology Comic

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