In a world filled with harsh environments, the inhabitants, including Kureha and the Defense Squad in Irodori Settlement, lead content lives. Their days revolve around strategizing ways to boost participation in the smartphone game 'Hagane Orchestra,' where they are characters. Their dedication knows no bounds as they delve into the game's intricacies, exploring themes of camaraderie, perseverance, deceit, and hopelessness. Through the perspective of a young man, his companions, and the Haganes, a tale unfolds of unity akin to a harmonious orchestra.