Saki, a married woman, has started working at a nearby family restaurant. During her training, she is instructed by Saki, a veteran part-time worker. Eri is very kind, but that is because she has sexual desires for the young and beautiful Saki... Then one day, Eri calls Saki into the break room and rapes Saki, despite her resistance. At first, Saki refuses, but as she leaves after closing time, while Eri is relentlessly attacking her in the shadows while the restaurant is open, she gradually begins to experience the pleasure of woman-on-woman sex...