``You had a fight with your sister, right? I'll help you make up.'' Koji was depressed after a fight between the couple and his wife returned to her parents' house, so his sister-in-law Mako came to help him. - Koji opens his heart to Mako who gently comforts him. - However, Mako's real target was Koji's cock. - That night, Mako's evil hand reaches out to Koji while he is taking a bath. - At the feel of her plump breasts pressed against his back, Koji desperately tries to suppress his worldly desires...