Spirit Chronicles

Seirei Gensouki: Spirit Chronicles (精霊幻想記, Seirei Gensouki) is a Japanese light novel series written by Yuuri Kitayama and illustrated by Riv.

Plot
Meet Rio: a callous orphaned boy living in the slums. At only 7-years-old, he realizes he's actually the reincarnation of Haruto Amakawa, a Japanese university student with a tragic past. While still reeling from this shocking epiphany, Rio also comes to learn that he possesses extremely potent magical abilities and uses his new powers to solve the kidnapping case of a little girl. His good deed is acknowledged, and he’s rewarded by being enrolled into… a prestigious academy for noble children...?