Kana Kojima (児嶋 加奈 Kojima Kana) is a 23-year-old high school Japanese language teacher at Kawanuma West who is infamously known by students as "Kojima the Demon" (鬼の児嶋, Oni no Kojima) due to her fiery temper. However, she often ends up in various erotic situations with Ichiro Sato (one of Kana's students).
Eventually she and Sato start dating in secret in order to hide their forbidden love. Sometime after Sato graduates, she agrees to be his fiancée.
