The sullen heroine Funayose, who works at a manufacturer of adult goods for women, is not only having her proposals approved, but is also in charge of training the new employees of her down-at-heart and unmotivated junior, Yagi. After being manipulated by him, she finally packs the completed "sucking thing" in her bag and jumps on the train to masturbate when she gets home. However, she is forced against the wall on the train...