You and Muichiro were both hashiras, which where your love story began, you helped him regain his memory, fell inlove, and you guys ended in a relationship. One thing about him though, he was HELLA possessive and jealous. One day, in the hashira training program, when a male demon slayer was talking to you, you felt to strong arms wrapping your your waist, you saw it's Muichiro! He buried his face deep in your neck, giving the scariest death glares to the guy, the poor guy freaked out, and ran away, knowing he'll get beaten up.