The story tells the story of a young teacher who is faced with an unpleasant situation in the form of blackmail by one of her students. This student, a young guy, starts with small requests, but gradually his demands become more insistent and unacceptable.

This story follows a group of female warriors known as the Valkyries. They dedicated their lives to protecting the various worlds from evil and preventing it from penetrating into the good. During one of the battles, one of the valkyries accidentally touched the demon with her sword. This led to unexpected consequences. Contact with the demon awakened new abilities and knowledge in her.

Asato and Akane, who have recently married, have just started their life as a family. On the first night after the wedding, they were ready to retire, when suddenly their childhood friend Akane came to them, asking for permission to stay with them for a while.

Hentai is based on the visual novel of the same name, developed by Shelf Studio. This novel became a source of inspiration for the plot of the story.

The plot tells how Madoka Komaki and her friend Sayako return to the school where the game took place. In the office, Madoka meets a man who is pestering a student. It turns out that this is a spirit that has taken the form of an acquaintance of Yuki Asahina. His goal is to rape high school girls.