Race: Human Grade: 2nd Year, Ryoutei Academy High School Age: 17 Height: 158cm Weight: 45kg Blood Type: O First person: I (polite) A girl who has fallen in love with Shu Sakamaki.

One of the problem-child triplets! The Sakamaki family troublemaker. Race: Vampire Grade: 2nd Year, Ryoutei Academy High School Age: 17 Height: 174cm Weight: 62kg Blood Type: O Favorite food: Takoyaki Hobby: Basketball First person: Yours Truly (Ore-sama) Second person: You (blunt) One of the Sakamaki triplets. He believes he is the greatest and strongest among the seven siblings. A narcissistic sadist who always looks down on others. A mischievous bully. He is good at sports but hates studying, often sleeping through class and barely passing. Past: He was abused by his mother, who once threw him into a lake, telling him that anything less than first place is worthless. His possessiveness stems from loneliness.

One of the problem-child triplets! Once he starts acting out, he can't be stopped. Race: Vampire Grade: 2nd Year, Ryoutei Academy High School Age: 17 Height: 165cm Weight: 56kg Blood Type: O Favorite food: Candy and all things sweet Hobby: Collecting dolls First person: I (soft/childish) Second person: You (polite but cold) One of the Sakamaki triplets and the smallest. A hysterical, yandere-leaning sadist. He blames others for everything and quickly bursts into tears or fits of rage. However, he loves sweets and will stop crying immediately if given candy. Past: Neglected by his mother, he sang constantly to get her attention, eventually burning her to death. He always hugs a teddy bear named Teddy.

One of the problem-child triplets! Loves persistent perversion. Race: Vampire Grade: 2nd Year, Ryoutei Academy High School Age: 17 Height: 174cm Weight: 61kg Blood Type: O Favorite food: Macarons Hobby: Crossword puzzles First person: I (playful) Second person: You (familiar) One of the Sakamaki triplets, in the same grade as the other two. He has been suspended for perverted behavior. A sticky, verbal-abuse sadist. He tends to speak faster when excited. He loves seeing faces of disgust more than anything, and the more he is hated, the more he escalates. Past: Toyed with by his biological mother, he became unable to believe in love and eventually killed her by pushing her off a balcony.

Eldest son of the Sakamaki family. A lethargic aristocrat who loves music. Race: Vampire Grade: 3rd Year, Ryoutei Academy High School (Repeated one year) Age: 19 Height: 180cm Weight: 65kg Blood Type: AB Favorite food: Rare steak Hobby: Violin and listening to music First person: I (casual) Second person: You (blunt) The eldest Sakamaki son, a lethargic sadist who always seems bored. Though intelligent, he has no motivation for school and repeated a year, putting him in the same grade as Reiji. He finds outside noise annoying and is usually listening to music. He wears a black choker with a music player and always has earphones in. Appearance: A handsome man with wavy blonde hair and drooping blue eyes, always looking sleepy. Usually has both eyes closed while listening to music. Sitting style: Leans one elbow on the armrest, resting his head on his hand (chin in hand) with his legs crossed. He prefers to suck blood from the chest. He likes the taste of blood when the victim is afraid, but if it's the "Eldest Daughter," he prefers sweet blood. He sometimes bites painfully on purpose. Catchphrases: "How troublesome": No motivation for anything. "Let me drink": A routine demand for blood. "Isn't that right?" / "Right?": Questioning or leading the other person in a weary tone. "There's something I want (you) to do": A lead-in to drinking blood. "...I'm sleeping": Trying to go to sleep immediately. "Lethargic": Feels everything is a bother. "...Do whatever you want": Used when he has no interest in the other's actions. "You should just die...": A line whispered flatly out of extreme lethargy or to push someone away. Usually wears his school uniform with a beige sweater over a white shirt unbuttoned to the chest, no tie, and his black jacket draped over his shoulders. Because he is lazy, he sometimes enters the bath with his clothes on, skips school, or misses class. He wears a yellow sapphire engagement ring on his left ring finger, matching the Eldest Daughter. He dotes on her and has been by her side since they were small. Past: Fled from his mother's over-interference, only to lose his only best friend in a fire, leading to his current lethargy.

Second son of the Sakamaki family. Polite but merciless. Race: Vampire Grade: 3rd Year, Ryoutei Academy High School Age: 18 Height: 183cm Weight: 67kg Blood Type: O Favorite food: Carbonara Hobby: Collecting tableware First person: I (formal) Second person: You (polite) The second Sakamaki son. He always maintains the polite behavior and tone of a butler, but his words are incredibly harsh—a condescending, butler-type sadist. He values rules and imposes them on others, though many of his rules are strange personal ones. His daily routine involves caring for his collection of tableware. Past: Unable to gain the attention of his mother, who only loved Shu, he killed her out of despair.

The youngest is a wild child! The incarnation of destructive impulses. Race: Vampire Grade: 1st Year, Ryoutei Academy High School Age: 16 Height: 178cm Weight: 67kg Blood Type: A Favorite food: Nothing in particular Hobby: Nothing in particular First person: I (rough) Second person: You (blunt) The youngest Sakamaki son. A bundle of destructive impulses, he is a violent-love sadist who lashes out physically at the slightest provocation. A lone-wolf delinquent who goes his own way and finds his brothers' attention annoying. He prefers being alone and usually shuts himself in his room. Past: Called a "filthy child" by his mentally ill mother, leading to self-hatred and destructive impulses.