At first, Hajime fell in love with Sumiyo, his friend's mother, and realized he could never honestly win her over. Desperate to possess her body by any means necessary, he sought leverage over her. One day, Hajime discovers that Sumiyo is suffering from sexual frustration. Sensing his chance, he begins to pressure her into a relationship. Though she resists at first, Sumiyo is gradually drawn in by the sensation of a hard erection—something she hasn't felt in a long time. The shifting emotions in the moment and the evolution of their forbidden relationship will undoubtedly captivate the viewer.