Genkaku Cool na Sensei ga Aheboteochi!

A higher school student has feelings for his teacher and decides to write her a passion letter. The teacher rips the letter into pieces before the class, humiliating him. Dejected, the boy visits the student nurse to create some sense of the situation. The nurse efforts to console him by giving him some pills, and proceeds to fuck his brains out - while they all do. The teacher walks in for this and shit hits the fan. Potential threesome? Or murder mystery?