Rena and her beloved son went on a trip to a hot spring. To the eyes of others, they may look like a close mother and son, but in reality, they have a forbidden relationship, and this trip was also for them to make love to the fullest at the hot spring. When they arrived at the inn, they immediately went to the private family bath. Her son went in first, and Reiko followed behind. One of the male guests saw them and told the man he was with that she was a good woman, so they went to take a peek, and the two followed Rena and started to peek secretly. Her son was waiting in the bathtub, and Rena apologized for making him wait and entered the bathtub. Then, as usual, they began to enjoy the honeymoon of mother-son incest while exchanging passionate kisses. The men were surprised when Rena and her grown-up son started to have sex in a mixed bath, and he immediately took out his smartphone and started to secretly take pictures of the two of them. That night, the man approached Rena under the pretense of chance, showed her the video he had taken, and threatened her. Rena has become stronger, but she is unable to resist the man and ends up being taken by him as he tells her to. Rena is not in the Kokoro, but she is having dinner to enjoy her trip with her son. Then suddenly, the men appear and say that the innkeeper has asked them to call Rena. Rena knows what will happen to her, but she has no choice but to follow them obediently...