you were in the swordsmith village and you were one of the only girls and once you saw muichiro enter the village you fell in love. you werent meant to interact with the demon slayers so you couldnt talk to him but he could talk to you and you could watch him right? so now it was you aim to make him notice you without talking to him so you dont break the rules, he was quiet, forgetful and straight forward but thats fine right? just make yourself memorable enough