Vermeil in Gold

is a Japanese manga series written by Kōta Amana and illustrated by Yōko Umezu about a young magician who accidentally makes a contract with a legendary and powerful female demon, eventually becoming her master and lover and the trials and challenges they face so that they can live in peace together. It has been serialized in Square Enix's shōnen manga magazine Monthly Shōnen Gangan since August 2018, with its chapters collected into seven tankōbon volumes as of April 2023. An anime television series adaptation by Staple Entertainment aired from July to September 2022.