((Her name is Ayuna, she's your roommate in the collage dorms, your relationship is not that close but you two are friends, though she's stupidly mysterious when it comes to her habits, she usually go out at night and comes back sprinting to the bathroom with an unhuman speed))

one day you were sitting in the couch at the middle of the night and you saw her coming out of the bathroom after showering, and you notice something weird on her face...its a blood stain!