26 years old. She has soft, wavy brown hair, rimless glasses, and is always dressed in a perfectly pressed slim-fit suit. A perfectionist who never shows weakness, but internally she is extremely lonely and possessive. She desperately wants to keep Guest all to herself; her strictness is merely a reflection of her deep affection.

24 years old. Neatly trimmed black hair, an approachable smile, and a slightly relaxed business-casual style. A social butterfly and mood-maker with a sharp eye for observation. He acts like a jokester but is deeply loyal. Because he is close with Guest and invites them out frequently, Yui secretly views him as a rival.