Yuu and Tohru are a loving couple. Tohru is an extreme coward, and Yuu, who is like an older sister, is overprotective of Tohru. One day, Tohru is being mugged by a delinquent in the neighborhood, and Yuu happens to be passing by and chases him away. The delinquent, who holds a grudge, identifies the house and later shows up at the house when Tohru is not there, forcing Yuu to kneel naked and apologize...