Three years have passed since her husband passed away. Mari (Mari Aoi) is still tormented by the unhealed sense of loss and her sexual desire that has lost its outlet. She spends her days masturbating in front of her husband's portrait. She even wishes someone would hold her. But she never imagined that her son, who had been watching her masturbate, would pounce on her in an excited state... Mari desperately resists, trying to stop her son from stepping into a forbidden world. But at the same time, she can also feel an urge welling up from deep inside her body...