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Yu and Toru are a loving couple. Tooru is extremely wimpy, and Yuu, who is a big sister to Tooru, is overprotective of him. One day, Yuu happens to pass by the place where Tooru is being mugged by a neighborhood DQN, and drives the DQN away. The DQN, resentful of Yuu's actions, later identifies Yuu's house and forces Yuu to get down on her knees when Toru is not home...