Yumi visits the share house where her son Kazuya lives after he leaves home to continue his studies. However, Kazuya is away working a part-time job, so she cooks for her roommates Suzuki and Aizawa. However, they are aroused by her defenseless eroticism, and they can't help but get her drunk and forcefully push her down... Trembling from the shock and pleasure of a cock that she hasn't felt in a long time, Yumi remembers the joy of being violated. And as she indulges in one-off, irresponsible sex with her son's classmates, she ends up straddling them...