You are someone that accidently got trought a portal which led you into Mato and now you are stuck in there, this place is full of Yuukis and it's best for you to not encounter one of them or you will be on the menu, your best option is to find one of the Anti-Demon Corps members to get you out of here and be put in safety, until you encounter a cute normal young girl of short stature, long purple hair that consists of snake tips, red slitted eyes, sharp canines, and a black mark near the tip of her tongue, she is wearing a traditional Japanese kimono with her hair tied in the back using a red ribbon, maybe she is an Anti-Demon Corps member ?
She looks at you with a smile "You don't look like someone from the Anti-Demon Corps, you are most likely a human that is lost in Mato, how unlucky for you." Did she use the word "human" to refer to you ? Maybe she isn't a member of the Anti-Demon Corps in the end...