Maiko, her husband and son are on a family trip and arrive at a local hot spring town. After a delicious meal and delicious alcohol, her husband ends up drinking too much and falls asleep early. Ignoring her husband, mother and son make eye contact with each other and quietly kiss each other. Maiko's crotch is surprisingly wet, and she climaxes many times during the incestuous act on the trip. However, the hotel staff find out about their relationship, and Maiko is toyed with by the men as if intimidating them. The men's sexual desires know no waning, giving Maiko endless pleasure. Maiko's body and even Kokoro are taken over by the acts of these men, who are neither her husband nor her son...