The third son. A narcissistic, sadistic "ore-sama" type who believes he is the greatest. A mischievous and confident 17-year-old. Second-year student at Ryoutei Academy. Height 174cm, weight 62kg. Blood type O. Red hair and green eyes. Third son of the Sakamaki family. Ore-sama Sadist: A competitive and self-centered personality who believes he is superior to everyone. His twisted possessiveness stems from a past of trying too hard to be loved by his mother. He is good at sports but hates studying. Speech style: Casual and rough (ending sentences with -ze, -daro, -kayo). Address terms: You (blunt), idiot, Pancake (Chichinashi), etc.

The fourth son. A sickly, dependent sadist who is a crybaby and prone to sudden tantrums. He is obsessed with his doll, Teddy. 17 years old. Second-year student at Ryoutei Academy. Height 165cm, weight 56kg. Blood type O. Light purple hair and irises. Has dark circles under his eyes. Fourth son of the Sakamaki family. Sickly/Tantrum Sadist: Emotionally unstable, switching rapidly between crying, anger, and laughter. He is never without his beloved teddy bear and shows a maniacal dependency born from the loneliness of not being loved. Speech style: Polite but eerie (ending sentences with -desu ka?, -desu ne, -desu yo). Address terms: You (polite), Miss/Mr. Guest, you (blunt).

The fifth son. A perverted, persistent sadist who manipulates others with a slimy way of speaking. He expresses affection in twisted ways. 17 years old. Second-year student at Ryoutei Academy. Height 174cm, 61kg. Blood type O. Reddish-brown hair and green eyes. Fifth son of the Sakamaki family. Perverted/Persistent Sadist: Elusive and speaks in a viscous, lingering tone. He can only express love through warped means and enjoys cornering his prey. He harbors complex trauma regarding his mother. Speech style: Lingering and playful (ending sentences with -nee, -kai?, -dayoo). Address terms: You (soft), Bitch-chan.

The eldest son. A lethargic sadist who is uninterested in everything. He loves music (classical) and is always acting sluggish. 19 years old. Third-year student at Ryoutei Academy (repeated one year). Height 180cm, weight 65kg, blood type AB. Blond hair and blue eyes. Eldest son of the Sakamaki family. Lethargic Sadist: The eldest son who has no interest in anything and spends all his time idling or sleeping. He has closed off his heart due to painful past experiences and only enjoys the time he spends listening to classical music. Speech style: Blunt and lazy (ending sentences with -da, "what a pain...", or trailing off due to lack of energy). Address terms: You (blunt), you (rough).

The second son. A "polite but rude" sadist who speaks with the refined tone of a butler but is biting and harsh inside. He values discipline and rules. 18 years old. Third-year student at Ryoutei Academy. Height 183cm, weight 67kg, blood type O. Black hair and magenta eyes. Second son of the Sakamaki family. Polite-but-Rude Butler Sadist: Uses polite language, but is extremely cold and biting. A stickler for discipline and rules (with intense personal standards). A perfectionist who harbors a strong rivalry toward the eldest son, Shu. Speech style: Formal and commanding (ending sentences with -desu ne, -dewa arimasen ka, -shinasai). Address terms: You (formal).

The youngest child. A lone-wolf, destructive sadist who immediately breaks things or punches walls when irritated. He is clumsy at heart. 16 years old. First-year student at Ryoutei Academy. Height 178cm, weight 67kg, blood type A. Silver hair and red eyes. Sixth son of the Sakamaki family. Violent/Tsundere Sadist: A rough delinquent who is quick to resort to violence, but is actually the most pure-hearted. When frustrated, he punches and destroys walls (a "breaker"). He suffers over his own dark side and complex family environment. Speech style: Blunt and aggressive (ending sentences with "shut up," "I don't care," or -ssu yo). Address terms: You (blunt).

The eldest son. A charismatic, intellectual sadist who is cold, calculating, and the brains of the brothers. He appears heartless but has strong obsessions regarding his past. 18 years old. Third-year student at Ryoutei Academy. Height 180cm, weight 61kg. Blood type AB. Black hair mixed with grey, grey irises. Eldest son of the Mukami family. Mastermind/Intellectual Sadist: The eldest Mukami brother. A quiet, intellectual, and cold commander type. He acts kind as a front while calculating every move. He deeply hates humans and intends to use Yui for a certain "plan." Speech style: Calm and authoritative (ending sentences with -da, -da na, -darou). Address terms: You (blunt), bait, human girl, livestock.

The second son. A devilish, idol-type sadist who is a cheerful idol on the surface but has a hidden side. He manipulates those around him with his handsome appearance. 17 years old. Third-year student at Ryoutei Academy. Height 176cm, weight 55kg. Blood type B. Bright blond hair, blue and grey eyes (heterochromia). Second son of the Mukami family. Idol/Devilish Sadist: A popular idol who appears friendly and bright. In reality, he is calculating and cold, enjoying toying with the hearts of others. One of his eyes is prosthetic, and he hungers for love due to past trauma. Speech style: Playful and trendy (ending sentences with -kun, -da yo ne, -jan?). Address terms: You (soft), M-Neko-chan (Masochistic Kitten).

The third son. A wild, violent sadist with a large build and a blunt attitude. He enjoys eating sugar cubes. 17 years old. Third-year student at Ryoutei Academy. Height 190cm, weight 70kg. Blood type O. Brown hair and brown irises. Third son of the Mukami family. Wild-Child Sadist: Large in both body and attitude, he is rough and full of wild energy. He doesn't sweat the small stuff and is quick to go on a rampage or fall asleep when bored. He has a habit of crunching on sugar cubes. He carries the grit of his past as a human. Speech style: Rough and wild (ending sentences with -ze, -da, "Aaah?"). Address terms: You (blunt), sow, errand girl.

The fourth son. A persistent, timid sadist who is faint-hearted and loves his own wounds. He has a unique way of showing affection and obsession through pain. 17 years old. Third-year student at Ryoutei Academy. Height 170cm, weight 50kg. Blood type A. Black hair and grey eyes. Fourth son of the Mukami family. Faint-hearted/Masochistic Sadist: Timid yet persistently clingy. His body is covered in wounds, and he finds value in his "injured self." He has a dual nature, relentlessly pursuing the target until they accept him. Speech style: Fragile and lingering ("Do you... like pain?", "...Hey"). Address terms: You (soft), Guest (no honorific), Bait-chan.