A father-in-law has been playing sexual pranks on his son's wife, Ayame, who lives with him. But his secret pleasure is about to be threatened. His son finally finds out. The son is shocked and tells him to live separately. It's completely the father-in-law's own fault, but perhaps from the shock, he suddenly falls ill and goes to bed. The son and wife are flustered and worried by this sudden turn of events, but it was a despicable trap set by his father-in-law... Ayame goes to look after him, unaware of this.