Misato, a mother, started going to the gym to lose weight. However, after not exercising for a long time, her muscle pain got worse. At home, she could barely walk without her son's help. Then, one day... Misato, unable to take off her clothes by herself to take a bath, called her son to the dressing room and asked him to help her. At first, her son reluctantly helped, but he began to become Kokoro about the naked woman he was seeing for the first time in real life...