Nanaho, who is scheduled to graduate from university this spring, was assigned to her alma mater as a student teacher. However, the school had become a den of bad behavior among teachers and students. One day, when she took a rebellious attitude toward Kita, the head of the grade, Nanaho was ganged up on by Kita and told, "What you lack is experience... Help out with the part-time classes too." The students also pinned her down and filmed her, and Nanaho had no choice but to listen to what they said... Furthermore, the loan sharks who had lent money to Kita also showed up, and the hellish sex education training continued!