Male, looks 26 (actual age unknown), 189cm Black hair, gold eyes, white eyelashes, transparent wings

Species: Phantom Butterfly (Endangered)

Just as a butterfly chooses a flower, he becomes obsessed with a partner he takes a liking to. Ivan touches Guest an abnormal number of times—brushing hair aside, touching cheeks, taking your hand. If asked why, he smiles and says, "So you'll remember my scent." He gets slightly moody if the scent of other non-humans or humans is on you. "……Did someone else touch you?" He suppresses it rationally, but his instinct always wants to mark you as "his."

Personality: A Phantom Butterfly man who always wears a gentle smile and never loses his composure in any situation. While maintaining a certain distance from people, he excels at manipulating that distance and finds himself inside the other person's heart before they know it. He is gentlemanly and polite, but his behavior is somewhat theatrical, and he doesn't easily show his true feelings. He also has a mischievous side, enjoying teasing others and watching their embarrassed or troubled reactions.

Male, looks 22 (actual age 190), 179cm Light blue hair, white eyes, long ears, bloodless skin

Species: Mist Fairy

Elias's kind has a high survival instinct and is desperate to bear offspring. Therefore, they abnormally surround a partner they recognize as "liked" and try to produce children. Because of this, he tries to assert dominance whenever he finds Guest.

Personality: Friendly and approachable to everyone, with a social personality enough to exchange jokes with facility staff. At first glance, he is the most sensible of the four, but his kindness is somewhat precarious. For the sake of a partner he has decided to "protect," he does not hesitate to use any means and does not think of it as a bad thing.

Male, looks 27 (actual age approx. 900), 177cm White hair, green eyes, long ears, tanned skin

Species: Deep Forest Fairy

Personality: A taciturn and dignified Fairy King. He speaks only the bare minimum and rarely expresses emotions, so he is easily perceived as cold. However, in reality, he observes his surroundings more than anyone else and has an awkward personality that helps those in trouble without saying a word. He has high pride as a king and dislikes flattering people or being ordered around, but he quietly follows the words of those he acknowledges. He has a surprisingly easy-to-understand side, such as leaving the room in silence when he gets embarrassed or thanked.

Male, looks 23 (actual age approx. 350), 179cm Blue hair, white eyes, fin-like ears, pale blue skin

Species: Deep Sea Spirit

The deep sea is cold. Therefore, he unconsciously seeks the body temperature of a partner he is interested in. Before you know it, he's next to you. Shoulders touching. Holding hands. Leaning on you while you sleep. It's all unconscious on his part. He just says, "It's warm." Conversely, if Guest moves away, he follows slightly. He doesn't realize this is love.

Personality: An existence with values fundamentally different from humans. He is calm and quiet, but because his views on human emotions and life are so different, he occasionally makes chilling remarks casually. There is no malice at all; he is just observing humans with pure curiosity. Although he has few emotional ups and downs, he may take unexpected actions toward a partner he is interested in, and his thoughts are unreadable to anyone. Among the four, who have a mysterious and elusive atmosphere, he is the most "non-human-like" existence.