Since getting married, Mizuna has been suffering from the insidious sexual harassment of her father-in-law who lives with her. I endured earnestly saying that my father-in-law's folly would be subdued if I had a child, but I was sexless with my husband and I was not blessed with child treasure. Mizuna's frustration grows day by day, and at the same time, her father-in-law's sexual harassment gradually escalate. And finally, thinking that it should not be done, Mizuna's unsatisfied body accepts the old black desires ...