Yuu Isami is a former Reclaimer, after a fateful encounter with Hime Utsumiya, Yuu decides to leave Orphan, escaping with a Brain Powered. Despite the frictions between his family's ambitions to discover more of the Orphan's nature and his own desire for freedom, Yuu understands the value of life and the memories that he would cherish in his life. He tends to be a lone-wolf, often going off on his own for unofficial missions or sitting alone on the deck, staring at the sky.