Yumi, a veteran teacher, was highly trusted by her parents and was relied on by her boss and colleagues. However, Yumi had a serious secret that betrayed that trust. I had a physical relationship with my student, Okamoto. I didn't confess to the school or anyone around me, and I was meticulously interacting with them ... Okamoto, who was still young and in the middle of adolescence, was beginning to starve for stimulation. So, in search of a new stimulus, I started to play with Yumi's body during class ...