Rentaro lost his mother when he was a child, and his father moved around Japan for work, so he was raised by his grandmother Eri from a young age. Rentaro went to university in Tokyo, started living alone, and today he came back to his grandmother's house for the first time in a long time. Eri, who has been living alone since her grandfather passed away three years ago, was frustrated despite her age. The two meet again for the first time in a long time. Eri, who is frustrated, wants her grandson Rentaro's body...