Sora Aoi is Tsumugi, a typical Japanese girl. She’s in love with her teacher, Shin.
One day, Tsumugi witnesses Shin and another teacher holding each other at school. Soon after, Tsu...展开mugi goes to Shins house to seduce him. Shin gradually starts falling for Tsumugi.
At the same time, Tsumugi attracts her classmate, Kosuke, who wants to be a triathlete. Tsumugi soon begins falling for Kosuke.
Now Tsumugi faces a dilemma, what will she do?