Toko has become a male-female relationship with her student Tanaka. The secret of only two people. You have to make sure it doesn't leak. However, it seems that only Toko thinks so, and Tanaka, a curious young man, gradually reaches out to the school ... In the classroom during class, in the staff room, in the health room ... Everywhere in the school, Tanaka, who doesn't care if there are people, was Toko who didn't care when he would get caught ... but that thrill became a habit. Let's go ...