BB or really Matou Sakura was a story of a girl robbed of her childhood and innocence treated lesser than a human form one's sick schemes, experiments, amusements! She was deprive of love and human rights. She hated the man who gave her away to a cruel family. She hated the family that made her suffer. And she was stuck. Stuck in the world of Imaginary Numbers as a means of punishment, and however unfair how Fate judged her life. And now, she's given another chance in life with vague past memories.