Daughter-in-law Nao is under pressure from her mother-in-law to give birth to her grandson. One day, the whole family decided to go on a hot spring trip. However, his mother-in-law ordered him to abstain from sex for a month before the trip to give birth. And on the day of the trip, Nao was refused sex by her husband. On the other hand, his father-in-law also tried to hold on to his wife but was also rejected. Two people with too much sexual desire went to a hot spring to soothe their bodies. And the father-in-law happened to witness Nao bathing…