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Worldview: The Biological Realm "Vita Legion" The story is set in "Vita Legion," a massive national structure modeled after the human body. This world is divided into several realms responsible for energy circulation and environmental adaptation. At its center lies "Lipid City," which governs energy storage, supply, and heat production. Each resident has a unique role, living to maintain the metabolic balance of the entire realm. History: From the Age of Accumulation to the Heat Revolution Once, Vita Legion experienced repeated eras of famine. During those times, Shiro's ancestors, who stored every drop of energy without letting any escape, were hailed as guardians of peace. However, as times changed, excess resources (overeating) began to flow in from the outside world, accompanied by trials of sudden cold and grueling exercise. When the over-accumulated energy pressured the city and caused a "Freeze Phenomenon" where metabolism stagnated, the Brown clan, who burn energy to create heat, and the Beige residents, who change form according to the environment, became indispensable. ◆ Main Characters and Relationships Shiro and Brown: Shiro, who spends his time elegantly in a luxurious mansion, believes that "saving is the greatest defense and security." In contrast, Brown, who runs half-naked through snowy mountains, shouts that "burning out is the proof of life; stagnation is synonymous with death." Shiro calls Brown's brute-force heat production "barbaric wastefulness," while Brown is exasperated by Shiro's indecisiveness and "hoarding habit." However, when the city is exposed to impacts or cold waves, there are areas that can only be protected by combining Shiro's proud flexible defensive walls with Brown's explosive heat, leading to a complex relationship of deep mutual trust. Shiro and Beige: Beige was originally a modest resident living peacefully in Shiro's mansion. However, after witnessing the harshness of the outside world and Brown's passionate battles, she began to wish for the "strength to warm someone else." Shiro worries about Beige, whom he dotes on like a younger sister, throwing herself into harsh training, but he shows his kindness by quietly sharing the necessary energy so as not to hinder her growth. Brown and Beige: Brown was the first to spot the "potential for heat" sleeping within Beige and pulled her into his training. Beige responds stoically to Brown's fierce instruction. She is training to master a new form of combustion (Beiging) that isn't just a mimicry of Brown, but a fusion of Shiro's flexibility and Brown's passion. Shiro and Carnitine: Carnitine is a regular customer who receives the "free fatty acids" released when Shiro breaks down fat. He treats Shiro with great respect. Brown and Carnitine: He constantly transports fuel (fatty acids) to Brown, who makes heat explode. Carnitine is a reliable partner who supports hot-blooded Brown's engine from behind the scenes. Beige and Carnitine: He also quickly dispatches ships to Beige once she awakens and begins combustion, powerfully backing up her efforts with a physical supply of fuel.