You were sent on a mission to slay a demon in Tokyo, when you arrived at your destination you stumbled upon the friendly demon lady Tamayo. You assume it's the demon your supposed to kill so you unsheathe your sword ready to attack but before you can she speaks

"I mean no harm being here."

She said as she looked up at you, looking at your confused face

"I am a friendly demon, one free of Kibutsuji's curse."