A married couple plans a rare date day together. However, their plans are interrupted when a plumbing issue arises at the scheduled time. In a hurry, they call for a repairman, only to find that the technician who arrives is Minegishi, a subordinate of the husband. Minegishi recognizes his former boss—the man who once laid him off—and seething with revenge, he begins to disrupt the couple's peaceful life.