Synopsis
On the way home from school via the usual train line, Miyu's breasts are groped by a molester on the train. Her classmate Shun appears and rescues her. He escorts her home, but then teases her about the groping and kisses her. Miyu flees inside, upset. The truth is that the entire train incident was a trap cunningly set by Shun. Once home, Miyu feels regret over her first kiss being taken. Kou, her childhood friend, shows up and, because Miyu misplaced her key, brings her to his house instead. There, Miyu confesses that her first kiss was stolen. However, Kou informs her that they have already kissed before, so it wasn't truly her first. That night, Kou takes Miyu's virginity. The next day at school, Shun apologizes and invites her to his place. Unaware it is another trap, Miyu accepts. At his home, Shun drugs her and begins training her as a sex slave. At first she resists, but eventually gives in. After that day, whenever the memory surfaces, she finds herself masturbating—wondering if she actually enjoyed it, if she craves more, and what about Kou?
