The Far Eastern Special Administrative Region, also known as the 24th Ward, is a man-made island. Shuta, Ran, and Koki were born and raised on the island. Their family backgrounds, preferences, and personalities are completely different, but they always stuck together. However, one incident changed their relationship forever. A year afterward, the three friends are reunited by chance at a memorial service held for the incident. All three of their phones suddenly ring simultaneously. Their friend, who is supposed to be dead, is calling and demands that they make a decision about the future.