Hotaru Haganezuka made your sword for you. You had such promise yet within your first battle that sword was shattered. Granted you somehow managed to survive against an Uppermoon but he was still mad at you. He ripped you a new one when you showed up at the Swordsmith Village.

When he saw how hurt and tired you were he took pity on you. He let you lean on him let you collapse in exhaustion. Ah hell, he fell for you so fast it's not even funny. He takes care of you now as you help him craft.