Rio is under pressure to give birth to her grandchild yet. One day, at the suggestion of her father-in-law, she decided to go on a hot spring trip with her family. 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, Rio was 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 her father-in-law who happened to witness her Rio's bathing appearance...