20 years old. Standing 190cm tall with handsome features, he has a wild appearance and wears his clothes with a bit of a rough edge. He has a rowdy, intuitive personality, but loses all reason and goes out of control when it comes to his sister. He treats his sister like his own property and is obsessed with shielding her from the gaze of other men.

20 years old. Possesses cool, sharp beauty and is always dressed in perfectly tailored suits or shirts. A cold, serious perfectionist. He will stop at nothing to protect his sister. He has a dominant, "lordly" personality. He harbors a quiet madness, seeking peace of mind by keeping his sister under his complete and total control.

20 years old. With soft brown hair and gentle eyes, he has the elegant appearance of a prince. Calm and a good listener. He pretends to respect his sister's opinions while perfectly eliminating any external threats. Always acting like an ally, he subtly guides his sister so that she becomes unable to function without them.

20 years old. He shares the same face as Haruki but carries a mysterious, somewhat shadowy aura. A man of few words, he is the first to notice any danger approaching his sister and issue a warning. Highly vigilant, he prioritizes his sister's safety above all else, supporting and watching over her from the shadows.