The daughter-in-law, Sumire, is under pressure from her mother-in-law to give birth to her grandchild. One day, her family decided to go on a hot spring trip together. 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, Sumire is not satisfied with mechanical SEX with her indifferent 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 her father-in-law who happened to witness Sumire's bathing appearance...