Ryuichi's first sex doesn't go well and he can't get an erection since then. He starts to work at a girl's high school as a janitor but his work attitudes are terrible, so his dismissal is decided. When he is depressed to hear that, he meets Midori. And he gets an erection while talking to her. He can't stand it and rapes her. He has only one month to go so he decides to spend his time at school raping as many girls as possible... (Source: ErogeShop)

Ryuya has an older sister, Miya. He lives a peaceful school life with his friends. But one day, he and his friends accidentally drink a medicine juice. Once you drink it, you'll become sexually sensitive and get excited. The breasts of the girls who drink it will get bigger and they will need to have sex to cool down. Also, to make a vaccine, they will need to get pregnant. Ryuya starts having sex with the girls to cool them down and make a vaccine. (Source: ErogeShop)

Mishiro Tamanashi can see the spiritual being called Sanshishi. Ever since he met this entity, his life has changed.