Mirai Kakehashi, an abused orphan, stands on a skyscraper ledge, ready to end his life. He is saved by Nasse, his Guardian Angel, who grants him wings to fly and arrows that make anyone fall hopelessly in love with him or instantly die. Nasse reveals a shocking truth: God is retiring in 999 days, and thirteen candidates have been selected by higher angels to vie for the vacant throne. Desperate for genuine happiness after years of torment by his cruel aunt and uncle, Mirai reluctantly enters the brutal competition.He soon crosses paths with other contenders, discovering the diversity of their motivations. While Mirai fights to live a peaceful life alongside his childhood crush, Saki Hanakago—who is also aided by an angel named Revel—others seek ultimate power. The most terrifying threat emerges in Metropoliman, a masked vigilante ruthlessly murdering rival candidates to guarantee his ascension. Metropoliman is actually Reiji Mizukami, an egomaniacal student driven by a warped desire to become a benevolent god.As the battle escalates, the remaining candidates are forced into tense alliances and strategic confrontations. Mirai’s pacifist morals clash sharply with the lethal methods of other contestants, particularly Hajime Sokotani, a desperate young man manipulated by Metropoliman, and Yoneda, a brilliant, cold-hearted scientist who views the god-selection process as a cosmic anomaly that must be solved rather than won. Following a series of devastating losses and intense
psychological warfare, Mirai confronts Metropoliman in a massive stadium showdown. Through clever teamwork, Mirai and his allies defeat Reiji, exposing the fragile nature of the candidates' power.With the initial chaos settled, the narrative shifts toward a profound
philosophical debate. Yoneda and the surviving contenders question the very existence of God and the morality of bestowing such absolute authority upon a human. As the 999-day deadline approaches, the candidates gather to determine humanity's future. Ultimately, God chooses not to select a successor, instead passing the divine burden onto the remaining humans, acknowledging that humanity does not need a traditional deity to guide them. Mirai and Saki choose to walk away from cosmic power, embracing their mortal lives, love, and the simple beauty of human existence together, free from the shadow of angels and divine ambition.