Requiem 1

Akio Yashiro who is working as a music teacher at a girls' school one day allies himself with the demon's violin called Canon. Because of this violin he gains power over the school girls. The demon sucks out their sexual energy and hence increases his own power. So what happens is, the teacher lures one student after another into his music class where he gives them a "private lesson". Anyone who has ever taken lessons with him will become his slave and his violin. At the beginning the girls are still able to refuse...