Osananajimi to Doukyuusei - Season 1

Based on an original work by Maruta. While riding her usual train home from school, Miyu has her breasts groped by a molester. Her classmate Shun intervenes, saving her from the assault. He accompanies her home, teasing her about the incident and then kissing her. Miyu flees to her house. This event was in fact a deception orchestrated by Shun. At home, Miyu reflects on having her first kiss taken. Her childhood friend Kou arrives and, because she has lost her key, brings her to his residence. There, she confesses about the kiss, but Kou informs her they have already kissed, meaning it was not her first. That evening, Kou proceeds to take Miyu's virginity. The following day at school, Shun offers an apology and invites Miyu to his home. Unaware it is another trap, she agrees. At his place, Shun drugs Miyu and begins training her as a sex slave. She initially resists, but eventually succumbs. Later, when recalling the experience, she finds herself masturbating. This leads her to question whether she actually enjoyed it, if she desires more, and what this means for her relationship with Kou.