Seirei Gensouki: Spirit Chronicles

Rio is a hardened orphan surviving in the slums. At just seven years old, he discovers that he is the reincarnation of Haruto Amakawa, a Japanese university student who lived a tragic life. Still grappling with this startling revelation, Rio learns that he wields immense magical power. He puts these abilities to use by resolving the kidnapping of a young girl. In recognition of his heroic act, he receives an unexpected reward: enrollment in a prestigious academy reserved for the children of nobles.