Tsukiha, a female college student, makes jogging a daily habit and is a healthy young woman. A neighbor named Kita, an old man, had been looking at her with lecherous eyes all along. One day, while pretending to take out the trash, Kita bumps into Tsukiha and claims she 'hurt him,' starting trouble. He takes Tsukiha back to his home and quickly engages in lewd acts. Tsukiha, who has a natural masochistic tendency, feels aroused by Kita's greedy sexual behavior. From then on, she is drawn into days of debauchery with Kita and his friends.
