The daughter-in-law, Nao, is under pressure from her mother-in-law to give birth to her grandson. 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. And on the day of her trip, Nao is turned down by her husband for sex. On the other hand, her father-in-law also tries to embrace her wife, but is also 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 Nao bathing...