Misuzu-san no Obenkyou
(C76) [KinoKonomi (kino)] Pachuri no Obenkyou (Touhou Project)
[Rokkaku Yasosuke] Obenkyou ≒ Sex (COMIC Shitsurakuten 2014-01) [English] [Facedesk]
[Guild Plus (tatsuya)] Usagi-san to Obenkyou (Touhou Project) [Digital]
Mahou de Ecchi no Obenkyou! | Studying Sex with Magic!
Osananajimi to no Sugoshikata ~Obenkyoukai Hen~
Chiteki Bungaku Bishoujo to Ikimakuri Obenkyou Ecchi
Unicorn-chan to Himitsu no Obenkyoukai
(C84) [Shinsen Gokuraku (Shuragyoku Mami)] Hime-sama, Obenkyou no Ojikan desu. (Tales of the Abyss)
Hare-chan no Obenkyou
Yuri to Issho ni Obenkyou.
Shishunki no Obenkyou
Immoral na Obenkyou - Immoral Study | 부도덕한 공부