Story
OVA by ZIZ Entertainment — Winter 2018, 1 episodes, Finished.
Newly appointed PE teacher Ikumi Sunohara’s elegant features and curvy, athletic body makes her an instant hit with the male students. However, one man gazes at Ikumi with a strange, suggestive stare. The man is Shiro Yasuno, the same twisted creep who trained and turned Ikumi's best friend into a sex slave! He smiles suspiciously at the appearance of his new prey, Ikumi.One night, Ikumi searches the desk of Shiro Yasuno, whom she has suspected for some time, to find clues about her missing best friend.
Synopsis via AniList (English).