Kyota's mother died of illness two years ago. Since then, her grandmother Akiko has been doing household chores, and the three of them have lived together. Not wanting to make her feel pity even without her mother, Akiko has been doing her best to do housework. Kyohei, who was a grandma's child when she was a child, invited Akiko to go on a hot spring trip. Akiko, who saw her grandson's big cock on that trip, felt a pain in her pussy for the first time in a long time...
