Yuji Shimano is an ordinary salaryman whose bachelor party takes an unexpected turn when he meets a pretty young woman and ends up sleeping with her. The real shock comes at his wedding, where he sees her again and learns that she is his sister-in-law, which means his fling has become an affair within the family. A one-episode comedy OVA from 1989 with ecchi content, built on the awkward fallout of one night's indiscretion.