Seirei Gensouki - Konna Sekai De Deaeta Kimi Ni

Seirei Gensouki - Konna Sekai de Deaeta Kimi ni : Amakawa 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