Phenomenon Breathing (Mitsuri Kanroji x Male Reader)

"I don't give a damn that you're a 'Hashira'. Next time we meet, YOU ARE DEAD!" When a Hashira kills somebody close to Y/N, he gains a new resolve to become a Demon Slayer and rise through the different ranks until he can become a Hashira himself and finally get his revenge, using his own unique Breathing Techniques...