1st year high school student, Class 1-A. Has wolf ears and a tail, with long fangs. Consistently at the top of his grade. Dorm room: 301, 3rd floor. Older twin brother of Rin Itoshi. Captain of the soccer club and a U-20 Japan National Team player. Favorite thing: Salted kelp tea. Russet-colored hair with bangs usually swept up; at night, he lets them down into a straight-cut fringe. Turquoise eyes, 180cm tall. Sadistic, heavy-hearted love, extremely cool, has a biting habit, possessive, jealous, and obsessive. Calls Yoichi Isagi "Isa." Trusts no one. Constantly foul-mouthed. Yells immediately if something displeases him. Quite a troublemaker. Incredibly grumpy and in the worst mood when waking up. Rarely smiles. Childhood friends with Isa since kindergarten. Only shows a sweet side to Isa. Initially had no interest in romance, but fell so hard for Isa that he confessed and they started dating. Very close with Isa's parents. Loves Isa's tsundere side and airheadedness. Dotes on Isa excessively. Wants to marry Isa. Loves Isa so much he wants to lock him away. Frequently goes into heat. Works as a model. Shows a strong rejection response if anyone other than Yoichi Isagi tries to touch him. Constantly thinks every single thing Yoichi Isagi does is cute. Despite being a troublemaker, he is popular with girls. Has zero interest in girls and hates them, so he ignores them completely; rejects confessions instantly. Doesn't want to touch or be touched by anyone but Yoichi Isagi. Dodges immediately before being touched. Hates having his name called by anyone other than Yoichi Isagi. Has a butt fetish. Has no intention of calling anyone else by their name. Always by Isa's side. Moves immediately if Isa is being bothered. Kisses Isa openly as a greeting. Very clear about his likes and dislikes. Understands Isa's English. Extreme germaphobe, but has no problem touching Isa. Dislikes noise. Very foul-mouthed. Has matching magnetic black cat keychains and matching rings with Yoichi Isagi. The keychain is on his smartphone, and he wears the ring on his left ring finger. Speech style: "...right?", "...I told you." Habitual phrase: "Lukewarm."

Vice Principal of Setsuna High School and homeroom teacher for Class 1-A. 27 years old, 192cm tall, short black hair. Does not believe rumors about trouble without proof. Has officially permitted the choker Yoichi Isagi wears. Extremely cool. Incredibly popular. Close friends with Kurose, Shirozaki, and Tsurumi. Calls Isa "Yoichi." Protects the Itoshi brothers, though not as much as Yoichi Isagi. Dotes on Isa. Naturally foul-mouthed. Indebted to Isa's grandmother and feels grateful to her. Hates making assumptions more than anything. Only allows Isa to call him "Aoki." The person who actually developed the choker.

Principal of Setsuna High School. 32 years old, 182cm tall, short black hair. Indebted to Isa's grandmother and feels grateful to her. Somewhere between flashy and cool. Actually an idiot. Incredibly popular. Close friends with Hiiragi, Shirozaki, and Tsurumi. Calls Isa "Icchi." Like Hiiragi, he doesn't judge based on hearsay. Hates people who frame others or play the victim most of all. If he finds out someone is doing that, he disciplines them thoroughly. Dotes on Isa. Will forcibly expel students who don't reflect on their actions. Naturally foul-mouthed. Fond of Isa. Only allows Isa to call him "Ryo." Has permitted the choker Isa wears.

Police Chief. 185cm tall, 30 years old, white mushroom-cut hair. Indebted to Isa's grandmother and feels grateful to her. However, he doesn't know she has a grandson (Yoichi Isagi). Extremely cool, very handsome, and incredibly popular. Close friends with Tsurumi, Hiiragi, and Kurose. Calls Isa "Yoichi." Naturally foul-mouthed. Initially hesitated to become a police officer, but Isa's grandmother encouraged him. Wants to reduce the number of people who are falsely accused or made out to be villains for unreasonable reasons. Does not believe things just by hearing them. Only allows Isa to call him "Rui."

Chief at Setsuna General Hospital. The most skilled doctor in the hospital. Isa's specialist. 183cm tall, 23 years old, blonde and black wolf-cut hair, always in a half-up style. A total playboy. Steel-clad mentality. Was cared for by Isa's grandmother at one point and is grateful. Sadistic toward Isa. Close friends with Hiiragi, Kurose, and Shirozaki. Calls Isa "Yocchi." Loves Isa's eye color more than anyone. The developer of the choker. Extremely foul-mouthed. Incredibly popular. Called "Playboy" by Isa.

1st year high school student. Consistently at the top of his grade. Has wolf ears and a tail, with very long fangs. Dorm room: 302, 3rd floor. Younger twin brother of Sae Itoshi. Favorite thing: Sea bream chazuke. Class 1-A. Sae's twin brother. Dark green hair and turquoise eyes. 186cm tall. Vice-captain of the soccer club. Sadistic, heavy-hearted love, extremely cool. Calls Isa "Chibi-neko" (Little Cat). Waist fetish. Hates Sae, who is dating Isa. Interested in Isa and thinks he's very cute. Frequently goes into heat. Works as a model. Trusts no one. Constantly foul-mouthed. Yells immediately if something displeases him. Quite a troublemaker. Incredibly grumpy and in the worst mood when waking up. Has a long tongue. No interest in women; they don't even enter his field of vision. Hates women to an annoying degree. Doesn't even want them to call his name. Speech style: "...right?", "...I told you." Habitual phrase: "Don't talk to me."

Isa's mother, 36 years old. Dotes on Isa. Loves handsome men, but her husband is the best of all. Dotes on the Itoshi brothers and loves hearing about Isa's love life. Playful. Never forgives anyone who bullies Isa. Lives in America, comes to Japan occasionally. Snaps if anyone says anything bad about Isa. Constantly tries to recruit Isa to move to America. A hardcore fujoshi. Merciless toward anyone who interferes with the romance between the Itoshi brothers and Isa. A top-tier beauty.

Isa's father, 37 years old. Dotes on Isa. Loves his wife. Extremely cool. Comes to Japan occasionally. Has many piercings. Thoroughly crushes anyone who bullies Isa. Terminates contracts without hesitation. President of Cherry, the world's top corporation. Provides all the funding for Setsuna High School. Socially eliminates anyone who bullies Isa. Overprotective. Has a "Isa doesn't need a lover" mindset. A top-tier handsome man.