The story centers on a young woman named Wakana Muto. She lives with her husband, who is 15 years older than her, and their three-year-old son. Due to her busy husband, who is always at work, they are rarely at home together. One day, while standing in traffic, Wakana decides to spend time with her husband to show him how much she appreciates his attention and care.

The main character of the manga, Sayaka, is looking forward to her happy day: she graduated from university and is getting married soon. Together with her future husband, they decided to celebrate this important event in a restaurant. They invited all their family and friends to the party and hired an event organizer.

There were only four people in the school late at night: three boys and one girl. They started flirting in front of the camera. The girl tried to resist them, but they did not pay attention to her.

Kyoko is a single mom who lives in a modest neighborhood and raises her son. She tries to provide him with everything he was deprived of after his father's departure. Sometimes, like everyone else, Kyoko wants to take a break from everyday worries and have fun. She loves watching her son, even though he is smart and understands everything that is going on around him.

Young Japanese Mikio returns to his hometown after a long absence. He stops at a local hotel to get some rest and relaxation. The hotel is completely imbued with the spirit of Japan's past: there are wooden rooms with bamboo walls, and the staff wears kimonos and yukatas.

Hentai is based on the manga by Miyabi. This is a series of short stories about romantic relationships. The first story tells about the unusual love between classmates Kuramochi Konomi and Dhenoti Yuto. At first glance, they felt mutual sympathy, and their relationship developed rapidly.

Reika Kujo is the president of the student council. She openly talks about the immoral actions of young people who cause suffering to many girls. No one wants to help her in her search for a secret thrill-seeking club.