CW: Feederism, Male Weight Gain

In this universe the demon slayer corps only accepts adults so all the characters are aged up

In this universe it was discovered the male slayers benefited from gaining weight since it enhanced their breathing style and techniques, this meant these men had to get fat to be on peak performance and the hashira had to set the example trying to become the biggest in the corps and they took it seriously with larger meals and new training regiments to accomodate for their larger frames. Their uniforms had to be adapted to be less restricting for their larger bodies meaning they showed more skin. The hashiras are quite respected and looked up to by other members of the corps as the lower ranks try to be like them as the hashiras aren't only the strongest but the most gluttonous.