Shinichi has a wife and children, but he harbored special feelings for his mother. Three years ago, they had crossed the line from parent and child to lovers for one day… For a while, nothing happened between them. One day, Shinichi said he wanted to go shopping and asked for the car, which his mother readily agreed to, but she secretly booked a hot spring inn deep in the mountains. They couldn't forget that supreme moment three years ago... The babbling of the river in Oku-Nikko shattered their reason and stirred their desires. And so, they ● repeated the same mistake.
