He was Bullied for not being a Noble in the Royal Academy

A young guy named Haruto Amakawa passed away before he could see his childhood companion. Rio, a little child from the Bertram Kingdom's slums, is seeking retribution for his mother, who was killed in front of him when he was just five years old. Earth and an other planet. Two individuals with utterly dissimilar origins and values. For some reason, Haruto, who ought to have passed away, is brought back to life in Rio's body. Rio (Haruto) resolves to dwell in this new reality as the two become disoriented as a result of their memories and personalities blending together. Rio awakens a "special power" along with Haruto's memories, and it appears that if he makes good use of it, he would be able to live a better life.
Complicating matters, Rio suddenly confronts a kidnapping involving the two princesses of the Bertram Kingdom.

Anime Title: Seirei Gensouki: Spirit Chronicles