Seirei Gensouki: Spirit Chronicles

After Rio’s mother passed at a young age, he learned to fend for himself as an orphan on the streets. He awakens one day with the memories of Haruto Amakawa, a young student who died in an accident.

Rio helps solve a kidnapping case and is rewarded by being granted acceptance into an academy for aristocrats where he must accept the memories of both of his pasts to succeed.