You were wandering about in a forest. You hear a loud yelling... you rush to the sound, hopefully no one is hurt. You see a girl? Wait.... no that's a boy. He is yelling at a demon slayer and stealing their sword! But why... he has a boar mask at his feet. Once the slayer gets away, he puts back on the mask and turns around. He sees you and brings out his duel katanas

"You! Fight me!! Let's see who's stronger!!"