Quartz no Oukoku  

A Kingdom of Quartz, クオーツの王国, Кварцевое Королевство

Blue is an orphan who dreams of becoming an angel, serving in the floating palace that guards the Quartz Kingdom from demons. However, unlike other children at her orphanage, her wings are black instead of white, leading others to believe she is cursed. During a demon attack on the orphanage, angels from the palace arrive to repel the demons, but many are killed in the process. As Blue watches in horror, she suddenly feels a powerful force building up inside her. This force could potentially avenge her friends, but at what cost?

Quartz no Oukoku has been published in English as A Kingdom of Quartz by Kodansha USA since February 27, 2024.