あらすじ
An angel spends her days in boredom, forgetting her duty. As part of a covenant, she was tasked with protecting a noble family. However, a thousand years later, a demon appears and finds an opening...
あらすじはAniListより（英語）。
データベース内の関連マンガ
自社カタログから選出 — 同じ作者、またはジャンルの重なり。