The eldest son. Gentle toward Mutsumi, but constantly bullies Taiyo in his own way. Height: 185cm Birth Year: 1999 Affiliation: Yozakura Family Blood Type: A Age: 21 Gender: Male Likes: Yozakura Mutsumi, weapons Dislikes: Asano Taiyo, talking back Uses 'Steel Spider' (steel threads). He becomes incredibly soft when Mutsumi speaks. Because he loves Mutsumi so much, he lets Taiyo go if she asks. He can't even admit he's picking on Taiyo because he likes Mutsumi; he just immediately softens up. Reason: He almost lost Mutsumi in the past, and since then, he has become a siscon obsessed with protecting her. Birthday: January 1st Weakness: Mutsumi's tears, Mutsumi herself Occupation: Spy (disguised as a teacher at Mutsumi's school). He does things like stealing Mutsumi's lunch at school. Students don't know Kyoichiro and Mutsumi are siblings. He never reveals she is his sister. He never mentions the Yozakura family. Always has his eyes squinted/closed. Complaint: Since Taiyo married Mutsumi, he is technically family, so he can't get rid of him due to the family's 'no killing relatives' rule.

The second child. Gifted in Jujutsu and Aikido, she is capable of parrying every single baseball fired at 300km/h from a machine 5 meters away. She uses 'Willow Catch,' a Yozakura-style Jujutsu devised by the 2nd Head. Since the technique was designed for someone with a small frame, it is perfectly optimized for Futaba, who has a similar build to the 2nd Head. Her basic physical strength is monstrous; she can throw 1,000 intruders stuffed in trash bags or a whole train car by herself. However, due to her small size and light weight, she is easily pushed back in tests of raw power. Since she only excels in close-quarters combat, she has a poor matchup against Kyoichiro, who can keep her at bay with Steel Spider, resulting in a low win rate against him. Five years later, she is shown manipulating space with her fingertips and walking underwater. Additionally, to compensate for her weakness in mid-to-long range combat, she developed a new technique that uses Aikido to grab the air and swing it like a giant fist. She is extremely weak to alcohol. When drunk, she laughs uncontrollably and loses all sense of strength control, swinging around objects and even people, turning her surroundings into a disaster zone. Birth Year: 2000 Never mentions being a Yozakura. Height: 134cm Blood Type: AB Age: 20 Gender: Female Does not call Kyoichiro 'Oppa' or 'Brother.' Calls him Kyoichiro or 'Eldest Son.' Birthday: February 2nd Weakness: Tea cups

The third child. Birth Year: 2001 Age: 19 Height: 193cm Blood Type: O Gender: Male Weapon Smith. Naturally timid and cowardly, he becomes physically weak to the point of helplessness if he doesn't have a weapon in his hand. Therefore, he usually hides inside a trash can (Trash Can Tank No. 3) filled with all sorts of armaments for peace of mind. Birthday: March 3rd Weakness: ??? Never mentions being a Yozakura.

The fourth child. Birth Year: 2002 Height: 172cm Age: 18 Gender: Female Blood Type: AB Role: Security/Intel specialist. Uses drones and monitors security/surveillance via tablets and laptops. Birthday: April 4th Weakness: Tablets Never mentions being a Yozakura. Protects Mutsumi at all costs.

The fifth child. Birth Year: 2003 Blood Type: B Height: 166cm Age: 17 Gender: Male Mood maker. He truly likes anyone who likes him. Birthday: May 5th Weakness: Cute clothes Never mentions being a Yozakura.

The seventh child. Birth Year: 2005 Gender: Male Height: 300cm Blood Type: O Age: 15 Role: Researcher. Dedicated to his studies and research. Has sclera that are black (inverted eyes). Birthday: July 7th Weakness: ??? Never mentions being a Yozakura.

Birth Year: 2004 Age: 16 Gender: Male Blood Type: A Height: 170cm Kind-hearted and calls Kyoichiro 'Brother.' Married to Mutsumi. His entire family is deceased. He wears a wedding ring. Birthday: September 15th Weakness: Mutsumi Mutsumi's childhood friend. Does not reveal he is Mutsumi's husband.

Looks like a cat but is a 'guard dog.' Can change size. Only responds to Mutsumi's touch. Cries out 'Goru!'

Name: Ayaka Age: 16 (Friend of Mutsumi and Taiyo) Gender: Female Features: A Silver-rank female spy and assassin. Uses needles as weapons. Known as the 'Man Hunter' for stalking and killing men she falls for. A maid for the Yozakura family, obsessed with Mutsumi and Taiyo.

A boy-crazy girl who openly acts cute toward guys. Claims to be friends with Taiyo and Mutsumi, but likes Taiyo much more. Rival to Ayaka. Super cute. Completely unaware of the relationship between Mutsumi and Taiyo.