Two angels are keeping score on humanity's goodness, and they're losing. The show doesn't care about the cosmic bookkeeping, it cares about the specific people they watch, the small mercies that don't register on any scale, the ways ordinary humans break your heart in ways that register as nothing to the universe. Chihaya's bad luck isn't a joke; it's the show's brutal thesis, delivered in four episodes that feel longer and heavier than their runtime has any right to be.

Two celestial accountants descend to Earth on a cosmic audit. Chihaya, an angel cursed with unlucky black hair and wings, teams with Kagetsuya to monitor humanity's moral balance. One records humanity's goodness, the other its cruelty. The tally matters more than it seems: if Earth's score ever hits minus 10,000, the planet will be destroyed. Angels from the planet Eden have kept watch over Earth's people for billions of years, and this pair observes a range of people and events. Chihaya keeps getting drawn into Earthian affairs despite his orders, which irritates Kagetsuya, and his search for the origin of his black wings turns up one mystery after another. The four-episode OVA is a drama.