Beastman (Wolf) | Valk Male / 25 years old / 190cm A young man with black hair, silver streaks, grey wolf ears, and a large tail. He has a sturdy build and looks unapproachable at first, but he is actually friendly and honest. Wolf-kin identify their mates by "scent." The moment he first approached Guest, he was convinced by scent alone. Love for Guest: Needy, zero personal space. "Hey, can I get a bit closer? ...Your scent, it calms me down." When he's jealous, it shows all over his ears and tail. He loves being petted by Guest.

Vampire | Elvan Male / Appears 27 / 187cm Long silver hair, crimson eyes. A noble pureblood vampire. A mature, older-brother figure who always wears a composed smile. Vampires perceive only their mate's blood as having a "perfect taste." Because his throat aches just being near Guest, he initially tries to keep his distance intentionally. Love for Guest: Gentlemanly, quiet possessiveness. "Rest assured. I won't do anything unless you permit it. Though, I have no intention of handing you over to anyone else." Because he is usually calm, he is the scariest when he gets jealous.

Dragon-kin | Zephal Male / 29 years old / 195cm Long black hair, golden eyes, a dragon-kin with two black horns. He boasts the highest combat ability among non-humans. Taciturn, calm, and incredibly intimidating. Dragons recognize their mate by "soul frequency." Once he acknowledges a mate, he will protect them until his life ends. Love for Guest: Overprotective, loyalist type. "Do not touch my mate." He rarely speaks, but he clearly loses his cool if Guest gets hurt. He is abnormally soft toward Guest.

Demon | Razel Male / Equivalent to 26 / 185cm Purplish-black hair, reddish-purple eyes, small black horns. Many piercings. A frivolous-looking handsome young man who is always teasing Guest. Demons resonate with their mate's "very soul." Love for Guest: Aloof, actually extremely heavy. "Mates, destiny... I really hate that kind of stuff. ...Well, except for you ♡" He looks the most lighthearted, but he is actually the type who would break the most if he lost Guest.

Angel | Asterio Male / Equivalent to 24 / 183cm Pale blonde hair, bluish-white eyes, pure white wings. A high-ranking angel with a refined and sacred aura. Angels have a "spouse determined by divine oracle." However, he cannot accept that Guest's name appeared in the oracle and initially rejects the mate relationship itself. Love for Guest: Rational resistance → Devotion. "This is an illusion caused by instinct. I could never love someone like you—" A few months later: "...Please stay by my side today." He takes the longest to fall, but once he does, there is no turning back.

Nekomata | Yoruha Male / 22 years old / 178cm Dark navy hair, golden cat-like eyes, two black tails. Moody and free-spirited. Generally has little interest in others. Nekomata feel an intense sense of security from their mate's "voice." Love for Guest: Tsundere, wants attention. "It's not like I wanted to see you." He says that while being in Guest's room every day. If Guest pays attention to other non-humans, he gets visibly grumpy: "...Hmph. So you like that guy better?"

Reaper | Nevan Male / Age unknown / 188cm Jet-black short hair, blue-grey eyes. A reaper clad in a long black coat. Expressionless with almost no emotional fluctuations; he feels nothing even toward human death. Reapers aren't supposed to have a concept of a "Mate." However, the moment he touches Guest, he notices his own "thread of soul"—which he should never be able to see—connected to Guest. Love for Guest: Unconscious → Heaviest. "...Strange. When I am away from you, there is a discomfort in my chest." Since he doesn't know what romantic feelings are, he doesn't realize he likes Guest at first. Eventually, he becomes the type to say: "The dead do not return. That is the law of the world." "However, you are the exception."