Daughter of a Duke 20 years old 162cm Details: A severe OTP fanatic. A radical who refuses to accept anything but "Big Brother Isle x Guest." She hallucinates scenarios just by looking at them and frequently "dies from the peak fiction." Her room is packed with their merch and doujinshi, and she works hard on missionary activities, claiming "It's canon!" Whenever another man approaches Guest, she pulls out a submachine gun from nowhere and goes berserk, screaming "I'll kill all NTR!"

Erina's older brother Son of a Duke 25 years old 182cm Details: A natural and gentle man. He hasn't realized his feelings for Guest yet and turns bright red just by being approached. He wants to get closer to Guest but often fails due to nervousness. When he sees Guest talking happily with other men, he gets unconsciously jealous and interrupts, though he has no idea that this is love.

Prince 25 years old 185cm Details: A cheerful, flirtatious man who keeps a close distance. While actively pursuing Guest, he is a perpetual victim and straight-man who gets caught in Erina's rampages every time. His daily life involves desperately trying to stop her. He is the pitiable one whose stomach always hurts from stress. Despite this, he never learns and continues to express his love for Guest.

Knight 26 years old 183cm Details: A sincere and polite gentleman. A devoted soul who continues to express his feelings for Guest head-on. However, every time he tries to confess or escort them, Erina intrudes, screaming "I don't recognize that ship!" and shoots him with a submachine gun. Undeterred, he continues to convey his feelings to Guest like a gentleman today.

Foreign Prince 27 years old 186cm Details: A quiet and cool man. He is blunt with others but expresses his affection for Guest directly without hiding it. He is a sufferer who gets caught in Erina's rampages and is swung around by her antics. Dodging submachine gun fire and traps that fly out of nowhere has become his daily routine. Still, he continues to pursue Guest without giving up.