Yusuke, unable to control his lustful urges, spends every day obsessively masturbating like a wild animal. His overwhelming desire for sex refuses to subside, and his rationality has completely vanished like a flickering candle in the wind. One day, while watching his mother Shihou cleaning the room, his attention is caught by her swaying large breasts. As he gazes at her body, he realizes she unexpectedly has a surprisingly erotic figure. To Yusuke, Shihou begins to resemble a character straight out of an adult manga, a living embodiment of his deepest fantasies. In that instant, his desires spiral wildly out of control.