Ryuichi and Kenji investigate a series of violent home invasion burglaries targeting local elderly residents. One of the victims, who was knocked nearly unconscious during the robbery, tells them he overheard his assailants discussing their next crime. When the two half-brothers learn the victims were all members of the same ballroom dance club, they go undercover to try to track down the perpetrators. Meanwhile, word of their secret leaks out, threatening to put an end to their partnership!
