Seirei Gensouki: Spirit Chronicles

A boy lives with memories of two lives-his own and that of Haruto Amakwa, who died in an accident before reuniting with his childhood friend. After losing his mother young and struggling to survive in the slums, Rio suddenly recalls his past life and realizes he has been reborn in a world of magic and swords. Now, with both lives intertwined, he must face his uncertain destiny.