Archangel Michael has become disheartened by humanity's progression and has presented the angels with a choice to preserve or eradicate the human race. A scoreboard will keep track of points, utilizing "Plus Checkers" for good and "Minus Checkers" for bad. The team that acquires 10,000 points will determine humanity's future. Chihaya and Kagetsuya, who were previously acquaintances at military school in Eden, are partnered on Earth but find themselves on opposing sides.
Chihaya is a distinctive angel with black hair, eyes, and wings who possesses significant power but unfortunately lacks experience, which irritates Kagetsuya. The Black Cancer pandemic adversely affects the angels, diminishing the color of their hair and wings before a painful demise. Tensions between the angels, particularly Chihaya and Kagetsuya, escalate. It seems that Chihaya is the crux of saving Earth and Eden.
