Yuuka, a visiting care worker, is struggling to make ends meet, so she makes ends meet by offering to massage the breasts of elderly people she visits. The elderly man's grandson secretly filmed this and was a classmate of Yuuka's son, Kosuke! When Kosuke is shown the video, he is shocked, but he also becomes very interested in the woman closest to him - his mother. Yuuka uses her own body to teach Kosuke the correct way to have sex, as he has the wrong idea that if you give him money, you can have sex, just like the elderly.