Tortured Orphan Unlocks Hidden Power and Becomes Stronger Than S Rank Magicians (1) - Video

Anime recap: Haruto is a young man who died before reuniting with his childhood friend who disappeared five years ago. Rio is a boy living in the slums who wants revenge for his mother who was murdered in front of him when he was five years old. Earth and another world. Two people with completely different backgrounds and values. For some reason, the memories and personality of Haruto who should've died is resurrected in Rio's body. As the two are confused over their memories and personalities fusing together, Rio decides to live in this new world.

Anime name: Seirei Gensouki: Spirit Chronicles (2021)