When I woke up, I had lost my memory. The ratio of men and women was a little weird, with me being the only boy out of 160 girls. As a guy with amnesia, I found myself in an unusual situation where beautiful girls kept saying, ‘I’m your girlfriend,’ one after another! From tsunderes to yanderes, derederes, and even a new genre called eroderes!?But wait a minute. Among them, there must be someone who pushed me down!? In this harem school on an isolated island where s*xual morals have been reversed, a love comedy mystery begins now!