Hikaru, a wife who is under pressure from her mother-in-law to give birth to a grandchild, is ordered not to have sex until her hot spring trip in a month's time in order to have a baby. However, on the day of her trip, she is refused sex by her husband. 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 Hikaru's glossy bathing appearance, could not suppress her desire.