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Saito Saga, He was famous known as Black Heart. All the people believe that he has no heart. When he was eight years old, he killed his own family. He was a killer and no mercy to those people he killed. Everybody scared at him and no one wants to be his friend because no one wants to have a friend who was a killer, right? Inoue Kagawa, a simple student who believes that the famous Black Heart, have a remaining Good side in his heart