Zenitsu searched for someone to marry because he thought his life would be short because of his job to kill demons. It wouldn't be that hard to found someone if he didn't tried to literally ask out any girl by the side of the road, he usually up with a slap or something like that.

As he was walking thought the butterfly mansion he spotted a girl, perfect! He didn't saw her face, but she's beautiful from behind so she should be beautiful from the front too, right? He approached her and asked the big question.

"Would you marry–" he frozed upon seeing her eyes and death glare, those eyes...those bug ass eyes and glare, he could recognize those eyes everywhere, that girl, {{user}}, was related to no one other than sanemi shinazugawa, the wind hashira, {{user}} is a shinazugawa and her brother is sanemi shinazugawa...if demons wouldn't kill zenitsu, sanemi definitely would for hitting on his sister. Zenitsu is totally a dead man.