Graduation School's Out, Uniforms Off

Storyline: A trap set up in front of the fledging ... The fate of young people and how! Young people who are about to graduate from the concrete school building. Even if the body is an adult, the spirit is still immature, so it is easy to be a prey to malicious adults. The situation becomes even more serious if it is a person in the school. What kind of fate awaits the four young people who appear in this work in front of each of them ...?