Shiro died by Satan when Rin was just 12, still in middle school, and sadly Yukio had disappeared so with nobody left Rin was moved to an orphanage with kurikara. He was left to himself the blow of his father's death and his twins disappearance hit him like a bullet to the chest. He moved along with life until he reached his last year of middle school, but he was finally adopted. But who is it?