Nanato Mukaido faces a terminal cancer diagnosis, granted three months to live before ascending as a God candidate. Driven by desperation to safeguard his pregnant wife Aya and daughter Nanaka, he channels his background as an apparel designer into crafting tactical gear—a militaristic green ensemble and helmet—for his alter ego, "Green." Chosen by the archangel Baret, he receives celestial weapons: Wings granting flight and Red Arrows enforcing absolute obedience for 33 days. He weaponizes these tools to manipulate elites, amassing 200 million yen for his family’s security, while deploying mind-controlled detectives and psychologists to expose rival candidates during Metropoliman’s Jinbo Stadium scheme. There, he identifies Mirai Kakehashi, Saki Hanakago, and an unnamed boy.

Post-stadium, Nanato allies with Mirai and Saki against Metropoliman, proving his loyalty by surrendering to a Red Arrow’s test. He brokers a deal with the JSDF for advanced armaments, contingent on ongoing cancer treatment, while strategically deploying his arrows to outwit adversaries and fund his operations. When Metropoliman’s subordinate Hajime Sokotani kidnaps his family from an amusement park, Nanato orchestrates a perilous rescue, hardening his resolve to dismantle Metropoliman’s regime. His coalition with Mirai and Saki solidifies into a coordinated force, combating bioweapon attacks and armed insurgents.

Consistently valuing family survival above his own, Nanato cultivates mutual trust with his allies, advocating for non-lethal strategies in the God candidate clashes. His narrative crescendos with unwavering determination to survive until Metropoliman’s downfall, clinging to hope of witnessing the celestial selection’s endgame, his fate intertwined with the conflict’s unresolved tides.