The stepmother invited her son to go on a trip to the hot springs. Bored at home, the stepmother decided to take her son on a trip. It had been a long time since she had gone to soak in the hot springs, so she brought her son to her favorite hot spring to bathe. While she was soaking in the tub, she was naked, and her son entered without wearing anything as well. However, the stepmother did not chase her son out. They chatted for a while, and then the stepmother played the flute for her son... The stepmother invited her son to go on a trip to the hot springs.