In truth, Asahi's life ended at the same time she died while playing Union, a world-renowned online RPG. When Union closed down owing to Asahi's death, the Subaru members split off. Six years later, Haruto logs onto a relaunched version of Re'Union and re-encounters Asahi, who has now died. Is she truly there, or is it simply an electronic ghost? To discover out, the former team members rejoin and enter the enigmatic and lethal online game.