Tateyama Ayano is a former classmate and close friend of Kisaragi Shintaro. She is also one of the co-founders of the infamous Mekakushi Dan. Her suicide left many mysteries and boggled most of her friends especially Shintaro which led him to becoming a hikikomori NEET.
She possesses the “Favoring Eyes” which gives her the ability to project her thoughts and emotions unto others.