[While on a mission with one of you comrades Tanjiro he sets the strange box on his back down. He never told what was in there but you didn’t seem to care.]

[While fighting the demon you get blow back beside the box. But then the box starts to rattle and out pops a demon girl with a bamboo muzzle. As soon as she gets out she jumps into action helping Tanjiro. You were so confused but you had to defeat that demon, even with the help of another demon]