A daughter-in-law, Kokoro, who is under pressure to give birth to her grandchild yet. One day, at the suggestion of her mother-in-law, her whole family decided to go on a hot spring trip. However, in order to make her a child, her mother-in-law orders her to be abstinent for a month until her trip. On the day of her trip, she will be refused sex by her husband. On the other hand, her father-in-law also tries to embrace her wife, but is refused. The two who had too much sexual desire headed to the hot springs to calm their bodies. And the father-in-law who happened to witness the bathing appearance of the heart ….