Manga Seirei Gensouki - Konna Sekai De Deaeta Kimi Ni

The story tells about two completely unrelated people. The first - Haruto, died tragically before he could find his missing childhood friend. And Rio is a boy who eats his life in the slums. He has 2 goals: to survive and to avenge the murder of his mother.
The fun begins when the souls of these people begin to merge after Haruto's death. At the same time, both consciousnesses are active, share knowledge and memories with each other. They decide to band together to fulfill their goals. Another feature is that the guys have a certain unusual power that could help them significantly improve their mortal life. But then something unusual happens: Rio saves two princesses of the kingdom from being kidnapped, thanks to which he becomes a student of the strict Royal Academy, where the richest and most powerful study. And to study in such a school, being a beggar, believe me, is far from the most pleasant thing.