Reino de Quartz, 1

Angels are elegant creatures with magnificent wings and unparalleled strength who, by the will of the Goddess, protect the Kingdom of Quartz from the infiltration of demonic forces. However, Blue is a girl born with mysterious black wings, so unusual that she has earned the rejection of her classmates, until one fateful day the gears of her destiny begin to turn, entangling her in new adventures and tragedies.