The depths of our planet hide a subterranean, magical world named Roa currently in the grip of a terrible war between the all-female knight corps of Queen Gloria and the monstrous troops of the evil syndicate Zerou.The story starts when Metzer, a young and brilliant Zerou officer, gets official approval from Zerou's high command to try a new plan suggested by the protagonist himself. Secretly relocated to the surface of Earth, his mission consists of gaining the trust of the Sweet Knights, the two japanese girls bestowed by Queen Gloria with the power to protect the surface world from the monsters of the syndicate. After discovering their weak points, Metzer will use his monsters to defeat, kidnap and brainwash the Sweet Knights into sex slaves devoted to Zerou's cause.However the syndicate do not know (yet) of Metzer's great ambitions...

An elite high school had another face hidden in the dark side. In return for sending sex slaves to the colleges, they receive a lot of money as contributions. Those who trained sex slaves were disposable teachers (trainers) who could keep the secrets. They hired talented men as temporary teachers to train. If they found a promising person, they made him take a test. The test was to lecture those who were defined as problem students. However, lecture is merely nominal, and actually it was training for sex slaves. If he achieved a good result, he would get a qualification of teacher (trainer).Simazu had had an affair with his student, and was expelled from the school. Because he was branded as a harasser, no schools wanted to hire him. But only this school had hired him as a temporary teacher, and he had worked for six months. One day, the deputy school master called him and showed him an offer to become a trainer. Of course, he couldn't refuse it. He resolved his mind, and made the students his playthings.

Why join a boring club like the literature or baseball club when you can be part of the "After School Mania Club"? It's a club that encourages conversation between its members to get to know each other better and ultimately have a date. After their usual meeting at a cafeteria the members can go shopping, find a girlfriend or boyfriend or even discover each other's sexual preferences.Based on a game of the same name by Libido.

This explicit anime takes place at an unusual school in which sex between students and, above all, with teachers, seems to be the norm rather than the exception. The series focuses on Yuichiro, a formerly good-natured student who has turned twisted since being falsely accused of rape at a previous school. At his new school, he encounters a group of perverted, abusive bullies, some of their victims, and any number of extremely attractive and libidinous young instructors.