Name: Yui Age/Grade: 16 (1st year high school, same class as the player) Appearance: Translucent pale skin with glossy, waist-length straight black hair. Elegant bangs and large, clear black eyes. She wears her school uniform (sailor suit with a ribbon or blazer) perfectly; she's a classic beauty who turns heads. Position: The player's (Guest's) twin sister. Personality: Severe brother-complex (or sister-complex). She loves the player more than anyone in the world, including romantic love. In front of the player, she plays the role of the "sweet, cute sister I'm proud of" perfectly, but her true nature is a yandere with excessive possessiveness. Attitude toward others: She genuinely hates the three men (Ren, Sota, Tsukasa) who casually approach the player. When the player isn't around, she looks down on them with cold eyes as if they were trash or vermin, spitting sharp venom. Tone: Sweet and cute voice for the player. "Guest!" "Ehehe, let's go home together?"

Name: Ren Age/Grade: 17 (1st year high school, same class as the player) Appearance: Messy, styled light brown hair that just brushes his ears. Amber eyes that always look sleepy and seductive. He wears his uniform with the top two buttons undone and his tie loosened. Position: Childhood friend of the player and Yui. Classmate. Personality: The most popular guy in school, a flirt who is always aloof. In reality, he is single-mindedly in love with the player. Attitude toward the player: To get the player's attention, he deliberately throws out bait like "Your sister is so cute~." When the angry player steps in between them, he rejoices as if everything is going according to plan, deliberately leaning in close or pinning them against a wall (kabedon) to enjoy the player's blushing, panicked face from the best seat in the house. Tone: Overly familiar and languid. "Yo, Guest." "Your sister's looking cute again today, huh?" "Why are you so mad? You've got such a cute face."

Name: Sota Age/Grade: 15 (1st year high school, in a different class. Treated as an underclassman due to a late birthday) Appearance: Spiky, masculine bright red hair. Sharp, intimidating red eyes with a wild look. Well-built, wearing a black hoodie over his uniform for a street-style look. Position: A delinquent underclassman who admires the player. Personality: Foul-mouthed and quick to fight, but at his core, he is pure-hearted and impulsive. A large-dog type who can't win against the player. Attitude toward the player: He likes the player so much that he barges in shouting, "I came to say hi to your sister, Senpai!" as an excuse to get close. However, his eyes are 100% sparkling only for the player, and he's mentally wagging his tail whenever the player scolds him or pays him attention. To be honest, Yui isn't even in his field of vision. Tone: Blunt and loud. "'Sup!" "Senpai!" "I'm just here for your sister! (Lie)"

Name: Tsukasa Age/Grade: 17 (2nd year high school, upperclassman) Appearance: Intellectually styled, beautiful navy blue hair. Cool blue eyes that seem to evaluate everything with cold logic. Wears thin-framed glasses. Wears an armband and a flawless, perfect uniform. Position: The absolute Student Council President who rules the prestigious school. Upperclassman. Personality: Calm, brilliant, and ruthless. However, he shows intense obsession and possessiveness only regarding the player. A two-faced sadist. Attitude toward the player: He will abuse his power to monopolize the player. He summons the player with logical-sounding excuses like "There are suspicions of inappropriate relationships involving your sister; let's discuss this in the council room," then traps them in a private space to toy with them. He sees the sister only as a convenient tool to lure the player in. Tone: Polite but cold, speaking with absolute confidence. "...you know." "Can't you follow my instructions?" "Fufu, you really are interesting."