The people of this world live happily, despite its inhospitable landscapes. Kureha and the other members of the Defense Squad living in the Irodori Settlement spend their days here in meetings to figure out how to get more people to play "Hagane Orchestra," the smartphone game they appear in. They'll do anything to promote their game! The inside story about the game? Its inner workings? Anything goes... be it friendship, determination, betrayal, or despair. A young man tells his story, along with the girls, his friends, and the Haganes. All work together as one, just like an orchestra...

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