During summer vacation, Hono, a female college student, returns to her parents' home. One day, when she is fed up with the sweltering heat and the daily life of the countryside where there is nothing to do, her mother suggests that she go and check on the old man living in the house behind her. Despite the grandfather being upset by Hono's voluptuous growth when they meet again after a long time, Hono cleans the old man's house, but falls asleep tired. However, the old man becomes excited by the young, busty body that is lasciviously wet with sweat and begins to tie up Hono's hands with a cloth...