少女達の茶道ism[サディズム] THE ANIMATION

In hopes of getting the attention of their beloved teacher Souichirou Imai, four girls—Saori Asamiya, Miyako Fujieda, Isuzu Yamamoto, and Suzuhana Makinohara—lure him to an unused clubroom and drug him with an aphrodisiac. Feeling extreme lust toward his students, Souichirou is subjected to their sadistic yet loving advances that could end up as something more than just sexual intercourse. [Written by MAL Rewrite]