Why Is My Reincarnation Like This?

He died in order to save people and traveled to a new world. He was selected by a strange school to become the "God Killer". There was a strange boy with him and later met his former mute wife. The three of them set out on a journey to save people. Together, they helped each other survive in this strange world. Among them, a special ability called "sin" appeared to change the cause and effect. They will shoulder the responsibility to fight back against the twenty-two gods belonging to mankind.