Tells about the world of MMORPG games called 'Union'. In the game, there is a legendary party named Subaru. The party has 7 members consisting of several childhood friends and school friends. Once, an incident occurred that caused death. The incident forced Union to close the server and make the party separate. Six years later, Haruto logged into a new game called ' Reunion ' and was reunited with Asahi and other childhood friends who should have died 6 years ago.