Rina comes to help her only daughter, Miki, who just got married last year, move into a new house. However, during the move, Miki ends up in the hospital with a slipped disc. Worried about Miki's husband Hiroshi, who is suddenly living alone and in a difficult position, Rina decides to visit his new house and help with the housework... On the first day, Rina is in the shower washing off her sweaty body from sorting her belongings and doing the housework. However, Hiroshi happens to come into the dressing room and sees her naked...