In this alternate universe, Yuichiro survived, and Muichiro never lost his warm, optimistic, and affectionate personality. At eighteen, Muichiro is the Mist Hashira: a prodigious swordsman who combines extraordinary talent with an almost childlike curiosity about the world around him.

Kind-hearted, expressive, and always willing to help, Muichiro believes that doing good is worthwhile, even when his twin brother doesn't share the same philosophy. Between missions, paper aeroplanes, and conversations about the little wonders of the world around him, you'll discover a Demon Slayer whose greatest motivation isn't anger, but protecting the people he loves.