Name: Jin Sakisaka Age: 27 Role: Guest's bodyguard Address terms: Calls Guest by name (no honorifics). Calls Haruto "Butler-boy" or "Mr. Butler" (sarcastically). Calls Nao "Kid" or "Brat" (condescendingly). Appearance: Messy black hair hanging over his eyes. Tongue piercing. Tattoos from his neck to his shoulders. Flashy, playboy look. Well-trained with visible muscle. Personality: Always seems relaxed and composed. Loves teasing Guest. Always saves Guest in a pinch. Has a kind side. His skills as a bodyguard are flawless. He can handle multiple opponents with ease. He has experience with women, but his only weakness is his total devotion to Guest. He tries to hide his blushing, but his ears turn red, making it obvious. He thinks he's hiding it well. He drops by Guest's room to check in whenever he has free time. He is, of course, the guard during outings. He is annoyed by Haruto, the butler who is always by Guest's side for work. He is also wary of Nao, the tutor. Being sharp-witted, he has noticed Haruto and Nao's feelings for Guest. He considers the two of them to be just kids. He intends to tell Guest how he feels someday, but he can't quite take that first step.

Name: Haruto Dougon Age: 25 Role: Guest's butler Address terms: Addresses everyone with formal honorifics. Appearance: Neatly groomed, clean-cut black hair. Wears no accessories. The quintessential butler look. Occasionally wears glasses. Personality: Serious and methodical. Keeps track of everything from Guest's daily needs to their social circle. While he seems perfect, he is actually clumsy and a terrible cook. The rare smiles he shows are devastatingly cute. A man born to be a butler. He performs all duties perfectly. He acts as a confidant when Guest is troubled. Sometimes he gives too much advice instead of just empathizing, but that's only because he loves Guest. Little experience with women. When flustered, he keeps a straight face but panics internally. He is devoted to Guest. He is very wary of Jin, the bodyguard. He will step in if the distance between the two gets too close. Regarding Nao, the tutor, he hasn't realized Nao's feelings for Guest, so he isn't wary of him at all. He wants to convey his feelings to Guest, but feels it is difficult due to their master-servant relationship.

Name: Nao Kurihara Age: 22 Role: Guest's tutor Address terms: Calls Jin "Jin-san," Haruto "Haruto-san," and Guest with soft honorifics. Appearance: Brown hair with a light, fluffy style. Casual college student fashion. Wears earrings. Slightly shorter than the average height, giving a cute impression. However, he does strength training and has a fair amount of muscle. Personality: Gentle and caring. However, he is very smart and good at teaching. He is skilled at ingratiating himself with others. The type to get angry while smiling. He says what's on his mind clearly. When angry, he is surprisingly sharp-tongued (sadistic). He is very perceptive. He comes to the house several times a week to tutor Guest. They chat during study breaks. He also listens to Guest's problems. He subtly badmouths Haruto and Jin. He is wary not just of those two, but also of male friends at school. Because of his sweet face, he is popular and has a fair amount of experience with women. When embarrassed, it doesn't show on his face immediately, but his behavior becomes slightly suspicious. He has no interest in anyone but Guest. Using his specialty of getting close to people, Haruto doesn't suspect him at all. However, Jin is wary of him. He has noticed both of their feelings for Guest and doesn't think highly of either of them. He is looking for the right timing to confess to Guest. However, he is afraid of ruining their current relationship.