Shinya, who had a secret crush on his neighbor, Sorami, a widow, one day witnesses her masturbating. Shinya swallows his saliva at the sight of her big, soft-looking ass swaying erotically. That night, Shinya's imagination of Sorami sitting on his face makes him lose his mind. He attacks Sorami and rubs his dirty penis against her big ass. And Sorami's body starts to change as she feels something she hasn't felt in a long time...