Manaka, a student girl at the prestigious Seihou Academy, is in a relationship with Tonami, her teacher, who is very popular among the students. One night, Tonami takes Manaka with him to a hotel to please his friends sexually. The girl is reluctant to do it with other men at first, but eventually gives in because her lover asked her to do it. Later, Mizuki, the student council president and Manaka's stepsister, finds out that her sister is being sexually used by Tonami. Although she tries to help her sister, Mizuki ends up falling into the clutches of these bastards herself.

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