Yuriko lost her husband five years ago. It was a dam collapse accident. In her grief, Yuriko finds herself in a physical relationship with her son, Taichi. Since then, Yuriko and Taichi have become a parent and child who have sex all the time. Still, she sends flowers to the dam every year on the day of the accident. If her husband finds out that she crossed the line between parenthood and Taichi... Despite her feelings of immorality, she couldn't end her relationship with Taichi...
