12-year-old Aoyagi Ritsuka is a troubled child. He has no memories of his life until the age of ten - causing his excitable and verbally-abusive mother to constantly berate him, demanding that he leave and return the 'real' Ritsuka to her. For the past two years, his older brother Seimei had been his devoted friend and protector - the only person who accepted Ritsuka's 'new' self. Recently, however, Seimei was…