Earthian

For five billion years, angels from the planet Eden have maintained surveillance over Earthians—the native inhabitants of Earth. Among these divine observers is Chihaya, an angel bearing inauspicious black hair and wings, who serves as a plus checker. He travels to Earth alongside Kagetsuya, his counterpart and a minus checker. Each pair of plus and minus checkers is responsible for cataloging earthly occurrences; should their accumulated score ever drop to minus 10,000, the planet will be condemned to destruction. The narrative follows Chihaya and Kagetsuya as they bear witness to the diverse people and unfolding events that shape their mission on Earth.