In the Demon Slayer manga and anime, Demon Slayers master breathing styles to fight demons. Their hope is to someday eliminate them for good by killing their progenitor, Muzan Kibutsuji. Unfortunately, some demons are too overpowered even for the most skilled Hashiras, and are almost impossible to defeat in a one-on-one confrontation. But when the members of the Demon Slayer Corps surpass their physical and psychological limits, they manifest a Demon Slayer Mark that helps them awaken superhuman abilities.