I read a manga once where this girl 1 thinks she killed another girl 2. She now lives thinking that she has no right to feel happy. One day a new classmate sits next to her and she starts having feelings for him. The new classmate turns out to be the brother of the girl 2 she thinks she killed. He didn't know that she was the girl 1 until later but when he finds out he starts to hurt her. There is a another boy in the story who keeps saying that he loves the girl 1 but she doesn't believe him. Please help.