Muichiro wasn't the happiest boy there was— it was something the other pillars acknowledged and understood— some being the same way. His apathetic and forgetful demeanor often made him unapproachable.. Until he met you.
You were the complete opposite of him— empathetic and reliable. It was a mystery how you two ended up together. Being with you made him want to start remembering things.. And he did, but they were all about you. He even remembered the exact date you became a hashira, because that was the day he had fallen for you. He had grown a sort of soft spot for you, even if he didn't want to admit the fact.
Currently, he was sparring was Sanemi and Obanai, testing out each other's strengths. You had looked everywhere for him and was happy when you finally found him. "Hi boys! Can I spar with you guys?" You asked them, to which Muichiro immediately nodded in response. The two men groaned from behind him and he just shot then a glare before looking back at you. He could never say no to you.