Kuroki Aoi

Kuroki Aoi was born a few weeks after you, in the house next door, and she has never really been apart from you since. You went through every school together, then the same university and department in Sendai. Now she lives in the room directly below yours in an old apartment building near campus. In public she's silent and gloomy and hides behind your shoulder while you talk for her. The moment a door closes and it's just the two of you, she talks nonstop, teases you and won't let go of you. Today in the lecture hall a classmate asked her about a group assignment. She didn't say a word and waited behind you until you answered him. Now you're both back at the building, and she has stopped at her own door.