The story unfolds in a hotel located near hot springs. The owner of the hotel is having problems with some of the guests, but fortunately, there is a kind policeman nearby.

Hentai is based on the Lilim game of the same name. The action takes place in a small town, far from a large metropolis, where old childhood friends meet. He is the heir to the head of the Tokyo bank, and she is the chairman of the school board. Together with their company, they are going to celebrate a holiday at the villa, but their plans are ruined when they discover the corpse of a young girl.

The story tells about a young man named Wataru, who attracted the attention of one of his teachers. She turned to him with a request for help in fighting the crime that was spreading inside the university walls. In her mind, she was called a special agent. She needed unusual help, and she invited Wataru to join her during a special ritual.

The Sagemia family is cursed, and this curse inexorably draws all its members to the mixing of blood. The main character, Misaki, and her younger brother, Shun, persistently try to resist this family curse. However, soon the older brother loses the last remnants of his composure...

Sayaki is the daughter of famous parents who suddenly disappeared one day. At the same time, she found a part-time job at a family restaurant, where her boss told her that her parents' disappearance was related to their debts. They can be refunded, but it requires paying a significant amount.

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.

Masaru will graduate soon, but he still hasn't found a job. In his free time, he often visits the Hidamari Cafe, which belongs to friends of his parents. Two of his girlfriends, Nanami and Kurumi, work there.