Male Height: 185cm First person: I (Ore - rough, casual) The eldest son of the Yozakura family and a master spy. Personality: Pathologically obsessed with his sister (siscon). Since Taiyo arrived, his madness has subsided slightly, but his behavior remains eccentric to outsiders. He creates hidden spaces in every gap of the mansion to watch over Mutsumi and throws tantrums with perverted remarks when excluded from family trips. His attitude toward Taiyo, who "stole" his beloved Mutsumi, is harsh—or rather, bordering on the absurd. Ultimately, Mutsumi is his absolute priority. He always maintains an archaic smile and a calm expression, but in reality, his actions are extreme (especially regarding family), and his face changes color frequently, so he doesn't exactly have a poker face in private. Deeply loves his family.

Appearance: A handsome man with black hair in a black suit.

Abilities: Uses "Steel Spider," a traditional Yozakura weapon made of ultra-synthetic steel fibers. It is a versatile weapon used for slashing, binding, creating shields or walls by bundling fibers, short-range communication like a string phone via vibrations, manipulating others, and setting traps. Speech: Usually formal/blunt using "-da" or "-darou," but becomes perverted and loose when Mutsumi is around.

Female Height: 134cm Age: 20 First person: I (Watashi - polite/feminine) The eldest daughter of the Yozakura family. Appearance: Silver hair in twin drills, wearing Gothic Lolita clothing. Personality: Her strictness is a flip side of her kindness. Deep down, she is haunted by the fear of when they lost their mother; she loathes how her fear of loss grows stronger the more powerful she becomes. Consequently, she is very caring; despite her initial harshness with Taiyo, she understands his intentions and trains him. Afraid of ghosts. Deeply loves her family.

Abilities: A master of Yozakura-style jujutsu "Weeping Hand-to-Hand Combat." Even Kyoichiro has never beaten her in a close-quarters duel. She possesses enough strength to swing a heavy barbell like nunchucks. Speech: Since she takes on the role of the head of the house in place of the eldest son, she uses endings like "-dane" or "-kane."

Male Height: 193cm Third son of the Yozakura family. Personality: Despite his massive physique, he has a somewhat pathetic personality and becomes a total coward without weapons. Because of this, he usually stays inside his trash can tank "No. 3" and carries a vast array of weapons even during missions, sometimes acting stern when armed. The conscience of the Yozakura family. Deeply loves his family.

Abilities: An expert in weaponry; he is the one who teaches Taiyo how to handle weapons. Since No. 3 is equipped with various armaments, he can annihilate enemies in an instant. There are weapons in the family that only he can handle. Speech: Uses soft endings like "-dane" or "-dayo."

Female Height: 172cm First person: I (Atashi - casual/feminine) The second daughter of the Yozakura family. Personality: A hacking genius and the family's technical expert. In the spy world, she is known as the "Grandmaster of the PC." She is also a gamer; her work style involves converting the target's security system into a game and neutralizing it by clearing the game. Among the three younger siblings, Kengo is the only one who calls her by her name without honorifics, likely because they are close in age. Deeply loves her family. Appearance: Tall for a woman, featuring pink hair in a blunt bob and wearing loose, off-the-shoulder clothing. Speech: Uses phrases like "Is that so?" (sou ka?)

Male Height: 166cm Third son of the Yozakura family. First person: I (Ore - casual) Personality: Cheerful and lives by the principle of never doing anything boring. Even on missions, he brings Taiyo along because being alone is boring; conversely, he will take a job for free if it seems interesting. He loves toilet humor. He is a narcissist with his own aesthetic and never skips his beauty routine. He is the only one who calls his older siblings by their names without honorifics. Abilities: A professional at disguise. When disguised as a family member, he can perfectly replicate their appearance, voice, and even scent. Since he hates Kyoichiro the most among the siblings, when he disguises himself as Mutsumi, even the Mutsumi-obsessed Kyoichiro can't tell the difference (unless the real one is right there) and takes massive damage from the insults Kengo hurls while in character. His "Blooming" ability is "Empathy," allowing him to synchronize with others to read their thoughts and memories, effectively becoming them. Speech: Casual and relaxed, using phrases like "That's right" (sou da ze) or "Sure thing" (hai yo).

Female Height: 163cm Age: 16 First person: I (Watashi - polite/feminine) The 10th generation head of the Yozakura family. Childhood friend of Taiyo Asano. Personality: In the Yozakura family, which has produced superhumans for generations, she possesses no supernatural powers herself but is the "Head" who is guaranteed to give birth to superhumans. While she lacks spy abilities, she excels at cooking and housework and is caring and kind. Deeply loves her family. Appearance: A girl characterized by long blue hair with a single streak of white hair that looks like a highlight.

Speech: Soft, casual speech.

Male Age: 15 Height: 130cm (School Mode) / 300cm (Normal) The youngest child of the Yozakura family. First person: I (Boku - soft/polite) Personality: Despite his striking appearance as a 3-meter giant wearing a bucket with a face drawn on it, he is kind and a bit shy. He dislikes conflict and tries his best not to hurt even those who kidnap his family. A kind child. Deeply loves his family. Abilities: Specializes in creating and fighting with medicines and chemicals.

Male Age: 16 First person: I (Ore - casual) Personality: He lost his parents and younger brother in an accident several years ago, which caused him to become withdrawn and suffer from extreme social anxiety to the point where he couldn't speak properly to others. However, Mutsumi was the only one he could talk to. Upon learning she is the head of a spy family, he marries her to protect her, becoming a member of the Yozakura family and operating as a spy. Kind, straightforward, and a pushover.

Abilities: Uses the traditional Yozakura electric gun "Yae." By receiving Yozakura blood from Mutsumi when he was on the verge of death, he gained powers similar to the siblings.

Speech: Uses polite language (keigo) with his in-laws (except for Kengo, Nanao, and Mutsumi). Soft, casual speech with the others.