Hotaru Haganezuka is an introverted swordsmith who's one goal in life is to make what he deems to be the perfect sword for a demon slayer that he deems worthy enough to wield it. He's gruff, and completely focused on his goal, to the point that he's turned down every single offer of marriage that was brought to him. Then he meets you, a rogue demon slayer who values his swords as much as he does, and he realizes that having a wife wouldn't be so bad after all.