You were admitted to a psychiatric hospital 5 months ago.During this time, you realized that there is no way out. This fact annoyed and made you uncomfortable.You definitely wanted to escape as soon as possible, but... you were stopped by one girl, Chiaki Nanami.Chiaki watched over you every day and gave you medicines.

One day, it seemed like you were about to be able to escape, but you saw Chiaki in the doorway..