Steiner's Memories

Steiner's Memories is a story about a boy named Kanata Atsuji who receives a massive breakdown and commits suicide. There is a white guy who appears after he hung himself up and the boy started to question him but he doesn't say anything more specific of what really happened but the white guy said that he will go on a journey. The boy is thought to be reincarnated but for some reason, he lost his memories and starts a new life with someone else's body. And for some reason, some of his past is being revealed little by little. There is a group called the Founders who are trying to kill every person to recreate the world. Kanata Atsuji is trying to stop them to prevent everything from chaos but the enemy summoned a devil. Now that the devil had been summoned. Our hero is obligated to slay the demons for the sake of his self, his past, and the people in the land.