Love of a Depraved Mother / Yokorenbo: Immoral Mother

Junko lost her husband ten years ago and has been living and raising her son Ryu alone ever since. When her son grew up, she gave him a sleeping pill and had sex with him at night, tormented by guilt, but she is powerless against lust. Two more years later, she gets married... Ryu remembers the night his mother took his virginity, and seeing her having sex with her new husband, he feels jealousy and an overwhelming desire to possess his mother as a thing.