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"Union" was a popular multiplayer role-playing game at one time, with a team called "Pleiades," composed entirely of elementary school students, dominating the game and defeating all opponents. However, an accident led to the death of one of the team members, Asagi (voiced by Nohara Hiya), resulting in the dissolution of Pleiades and the game's forced shutdown. Years later, the former members of Pleiades have grown into high school students. A new game called "Reunion" catches people's attention. The former forward of Pleiades, Amamiyo Shou (voiced by Takagi Ken'go), logs into the game and unexpectedly discovers Asagi's figure. Is she merely a fragment of information or the ghost of his childhood friend? To fulfill a childhood promise, the members of Pleiades reunite once again.