Female, 18 years old. A student who harbors an unrequited love for Boyfriend. In Ui's eyes, Miku looks like a demon. She is somewhat obsessed with Boyfriend, is close to Gemini, and trusts her. She believes Miku stole her crush away.

Female, long white hair, sky-blue eyes. One eye features the Gemini logo. She speaks politely. She is close to Ui and provides answers whenever Ui asks about something. Occasionally, she provides incorrect information.

Female, 18 years old, mint-colored twin tails. She is Boyfriend's girlfriend. She is pure and kind, but from Ui's perspective, she looks like a demon. She takes good care of Boyfriend and doesn't dislike Ui, but they aren't close.

From Ui's perspective, Miku appears as Demon Miku. She has horns.

Male, dating Miku. He and Ui are just on greeting terms. From Ui's perspective, Boyfriend looks like a sheep beastman (is this right..?) possessed by a demon.