The secret erotic development of a grandfather who drives a big-breasted female student crazy - memories of being trained in sweat that summer -

During summer vacation, female college student Hono went back to her parents' house. One day, when I was feeling fed up with the sweltering heat and the daily life of the countryside where there was nothing to do, my mother suggests I go and check on the grandfather of the house behind me. Despite her grandfather, who is upset by Hono's voluptuous growth after meeting again for the first time in a long time, Hono cleans the elderly man's house, but gets tired and falls asleep. However, excited by her young, busty body, sweaty and perverted, the old man begins to restrain Hono's hands with a cloth...