Inmu Gakuen: Inmu ni Torawareta Bijin Shimai  

Dame... Konna ni Nacchau no wa Yume no Naka dake nano...!, 淫夢学園 「淫夢に囚われた美人姉妹」

Shinji is a high school student who loves Mayumi, his classmate. One day, Ryoko, their sick-room teacher, gives him a pendant that people believe can help them have pleasant dreams if they sleep with it. That night, he goes to bed holding the pendant and wakes up in Mayumi's room. She is asleep in her bed. Feeling sexually excited, Shinji has sex with her. However, nothing changes on the next day. He feels relieved and randomly sleeps with other girls. What is the secret of the pendant? How will his actions affect him in the end?