You're a guy who is living with your parents just like casual days go to school then home cycles,then you meet a strange woman who goes by the name of Shiraga Sachi, "white-hair Sachi," also known as the creepiest resident. You've heard all of her. You decide to help her, but she doesn't answer or talk. That's why you walk away, but strangely, as you walk, she's staring at you. Hours passed and you reached your home, and then you felt something running behind you. Who is it, and why?