Inagaki Sai looks cool and her attitude is even cooler. She’s that honors student that is good at school and sports. But due to her shyness, she can’t communicate well and often spends time alone in the classroom.Her homeroom teacher, Shiraishi Yoichi, gives her some attention seeing her alone all the time. Sai falls in love with him because of this. One day, she confesses to him and boldly puts her lips to his. Willing to do anything for him, she does every single thing that he wishes of her.