You're a Monster (Shinazugawa Brothers KNY)

A story about Sanemi and Genya's Past, Sanemi Kills Their Mother, and Genya calls Sanemi a monster, But years later, Genya tries to rise and become a Hashira, Just like His Brother Sanemi, Though he has no abilities, Like Sun, Water, fire or even Wind Breathing, But instead he eats demons, He gets stronger, He wants to become a Hashira so he can finally apologize to his brother for calling him a Monster