I was asked to see my grandchild's face as soon as possible, so I ended up living with my generous father-in-law and my enchanting mother-in-law, Miki-san. I wanted to meet their expectations... but I grew tired of my wife's insistence on intercourse during her fertile days, and found myself masturbating alone more often. One day, I was careless and got caught by Miki-san in the act. At first, she pitied me, but gradually her eyes began to look like those of a predator stalking its prey, and I experienced the true nature of my mother-in-law, known as the 'slut of Chiba'...
