Feeling completely isolated, Aoi begins to rebel quietly. She refuses to follow the school's strange rules, breaking them in small ways — she steps outside the lines in the hallway, talks to classmates before 9:00 am. The cameras follow her every move, but no one stops her yet. That night, a new message arrives on her home system, not from her "parents," but from an unknown sender: "You can't leave. Run away, and you'll never come back." Aoi feels the weight of the walls closing in, but she knows she has to find a way out.