Yuka has raised her son, Ko-suke, all by herself. As he grows more and more like his late father, she finds herself harboring perverse feelings for him, but can only release this unfulfillable desire within herself. Meanwhile, Ko-suke secretly harbors feelings for his mother that go beyond those of a parent and child, hiding them as he goes about his daily life. However, on the night before his wedding, Yuka catches him masturbating and says, 'Because this is our last night together...' She gently strokes his stiff cock. But that's not enough for the two of them; unable to hold back any longer, they are driven by their forbidden desires…
