Story
On an artificial island in Tokyo Bay there is a special district commonly known as the 24th Ward, childhood friends Ran, Koki and Shuta hung out together. Their lives changed when their school caught on fire and Koki's sister Asumi was caught inside. They argued about the best way to save her, and instead of working together, Shuta rushed in but was unable to save her life. Now, a year after the incident, they receive visual messages from Asumi presenting them with life-and-death situations in which they have to decide on their course of action. A strange character called Carneades appears and threatens to thrust choices upon the world.