Demon Slayer: I Am Invincible with One Punch

Teacher Saitama traveled to the world of Demon Slayer for some inexplicable reason. In order to return home, he could only carry out the tasks issued by the system. In the end, the original situation where humans and ghosts were at odds with each other, and the ghosts were strong and the humans were weak, was instantly broken. Kamado Tanjiro: Mr. Saitama, please teach me the strongest breathing technique. Nezuko: Oooooow Twelve Ghost Moons: If you see a bald head, run away! Muzan Kibutsuji: There can't be a more perfect creature than me! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.