When he was a child, Kenta Kogure was asked to pursue a career as a doctor. Twenty-two years have passed since then, and college student Shizuka Kaneki comes to a junior high school as a teacher trainee. There was a slightly strange biology teacher there. She is a grown-up Kogure. After immobilizing Shizuka with medicine, he tries to recreate a certain experience using other trainees as test subjects.

Bad at sports, Takeshi and Ryo, a gay couple, get together with Akira and Mitsuo, another gay couple, to participate in a beach volleyball tournament all the while Ryo is set to meet a man he met on a dating site. As the tension grows, Takeshi's older sister, Rika, shows up with her lover, Yuichi, who was the captain of the volleyball club in high school.

Hayaki, an aspiring medical office worker, wakes up naked in an oil drum. When she asked for help through a hole in front of her face, Yuhei, a man who looked like a researcher, came to her. He threatens her, saying, "This is a clinical trial and you need money to get out.

The 4th volume of Eros Suspense that depicts the terrible living hell that unfolds in a secret cell. Noriko, an underground idol involved in a conspiracy, is imprisoned in an isolated prison "Area ∞". It is a terrifying cell where the worst rape murderer, Yoshida 3 brothers, has been imprisoned...

1st installment in "Zokuri. Kaidan Yowa" film series.