Basically, once in the fencing club she snaps and tells them of how unfair they are and that others are the ones who are guilty, she wants to die and get rid of her burden of being misfortune, then she sees her brother arguing, and he was about to die (or a least get injured) by falling down the stairs, so she puts herself inbetween hoping to die. Then she, passed out in the hospital, remembers her previous memories. At the end a man from her memories explains that she was the one convincing herself and embracing her title of misfortune. So when she awakens, she learns to embrace those around her. Her brother gives up on being her lover and resorts to being her family.
I love this manga but the ending was I don't know somewhat of it great manga though I don't really get the end.