In a hidden academy where angels, demons, and mythical beings study ancient magic, Kiko and Miko are fraternal twins—one an angel with flowing white hair and ethereal wings, the other a demon boy with spiky black hair and sly fox ears. Born to mixed heritage in a world torn between celestial and infernal realms, they were separated young but reunited at school. Dressed in crisp uniforms, the tall, fair-skinned teens navigate their differences while bonding over forbidden spells, their purple eyes sparkling with hesitant curiosity about each other's worlds.