Alas, I am Vermeil. A demon... The synopsis for Vermeil in Gold would typically describe Alto Goldfield, a student at a magical academy, who is on the verge of failing and being held back a year. In a desperate attempt to avoid this, he stumbles upon an old grimoire and accidentally summons a powerful demon named Vermeil. Vermeil, despite her immense power, needs to replenish her magic regularly through kissing Alto. The story then follows Alto and Vermeil's adventures at the academy, dealing with magical challenges, comedic situations arising from their unique relationship, and uncovering mysteries surrounding Vermeil's past and the academy itself.