"It's your fault, teacher. She's nice to me." Oda, a student, has feelings for his homeroom teacher, Shiho. He knows it won't come true, but he wants to tell Shiho about his feelings... A turning point comes during his days of anguish. He sees Shiho having a friendly conversation with a fellow teacher. It's obvious at a glance that they have an extraordinary relationship. Oda, shaking with rage that his feelings have been trampled on, devises a selfish plan.