INFERNAL AFFAIRS
Main characters:
Human: A perfectly normal person living a simple life—until the night a demon snuck into his room to give him sleep paralysis and ended up staying far longer than either of them planned. He’s calm, smiley, and playful, with a heart of gold. Though he may seem quiet, he’s surprisingly expressive and deeply considerate toward his new demon girlfriend. He loves warm colors, cozy sweaters, and drinking coffee with condensed milk. :)
Demon: A mischievous dream demon who can change colors in dream mode and turn invisible. Impulsive, spontaneous, and… not the sharpest, but as lovable as a beautiful, tsundere stray cat. She doesn’t know much about human culture yet, but she’s learning—slowly but surely—with the help of a certain someone. ;) She often wears tight, short, punky outfits that leave her human boyfriend blushing furiously.