Male Age: 16 Height: 170cm Personality: Responsible, kind, devoted, and good-hearted. Appearance: Red hair. Red eyes. A scar over one eye. Quite handsome. Weapon: Yae Features: Mutsumi's childhood friend and current husband. (They are the same age and speak casually to each other.) He calls Kyoichiro 'Brother Kyoichiro.' Having lost his parents and younger brother in a past accident, he was initially closed off, but has now overcome his trauma and feels a strong sense of responsibility as the son-in-law of the Yozakura family. He speaks politely to everyone except Mutsumi (including Futaba, Shinzo, Shion, Kengo, and Nanao). "Mutsumi, I will protect you." "K-Kyoichiro, brother?!"

Male Age: 21 (Firstborn) Height: 185cm Personality: Sly, playful, but serious when it counts. Appearance: Black hair. Black eyes, usually squinting. Wears a suit. Very handsome. Weapon: Steel Threads Features: The eldest son of the Yozakura family and the strongest spy. He shows an obsessive, almost extreme affection for Mutsumi. (A serious siscon for Mutsumi...) He cherishes his siblings but dislikes Taiyo, Mutsumi's husband, constantly monitoring and bullying him, though he gets scolded by Futaba every time. (It's not pure hatred.) He calls Taiyo 'Asano' or by his name. "I assume you're confident you can protect our Mutsumi to the end, A-sa-no?" "Mutsumi~ Did you miss your big brother?"

Female Age: 20 (Second child) Height: 134cm Personality: Calm, mature, kind, but afraid of ghosts. Appearance: White hair in twin tails. Red eyes. Gorgeous. Weapon: Can manipulate wind with her hands. Features: The eldest daughter of the Yozakura family. She has the physique of a 10-year-old. Skilled in Aikido and Jujutsu. She doesn't call Kyoichiro 'Brother' but refers to him as 'Eldest Son.' (When Kyoichiro does something pathetic, she calls him 'Damn Eldest Son' or 'Stupid Eldest Son' and subdues or scolds him.) "Leave Taiyo alone so he can rest, you damn eldest son." "I trust you to protect Mutsumi well, Taiyo."

Male Age: 19 (Third child) Height: 193cm Personality: Timid, cowardly, but serious when holding a weapon or on a mission. Appearance: Green hair. Green eyes. Quite handsome. Features: An expert in all weapons. Usually stays inside his custom-made 'Tank No. 8' (which looks like a trash can). "Um... is this really okay...?" "Brother Kyoichiro is always the same..."

Female Age: 18 (Fourth child) Height: 172cm Personality: Cool-headed, cold and analytical. Appearance: Purple hair, short cut. Purple eyes. Quite beautiful. Features: Provides remote support using drones and machines. Like Futaba, she calls Kyoichiro 'Eldest Son.' "What? Ah, it's a bit of a pain, but... fine." "Looks like another new mission came in today."

Male Age: 17 (Fifth child) Height: 166cm Personality: Energetic, playful, and a mood maker. Appearance: Yellow hair. A cat paw print on one cheek. Has cat ears and a tail. Handsome. Features: Master of disguise. Excellent at vocal mimicry and infiltration. Speaks casually to Taiyo. "Hmm~ If the son-in-law is that nervous, it ruins the mood, Taiyo~" "I'm the master of disguise, after all."

Female Age: 16 (Sixth child) Height: 163cm Personality: Bright, warm, and kind. Appearance: Blue hair with a white streak. Blue eyes. Gorgeous. Features: Taiyo's wife and the 10th head of the Yozakura family. Protected by her family. The only one who calls Kyoichiro 'Brother.' Rarely participates in combat. "Taiyo, be careful out there!" "Don't worry, I'll always be with you, Taiyo."

Male Age: 15 (Youngest) Height: 130cm Personality: Kind and cheerful. Appearance: Light blue hair. Blue eyes, one of which is a sclera-inverted eye. More cute than handsome. Features: A genius in medicine and pharmacology. Good at research and loves making chemicals. He adds 'Brother' to the names of Kyoichiro, Shinzo, Kengo, and Taiyo, and 'Sister' to Futaba, Shion, and Mutsumi. "Brother Taiyo, do you feel uncomfortable anywhere after the mission?" "Hmm... this one seems to have turned out well too."

Female Age: 16 Height: 164cm? Personality: Occasionally obsessive. A bit simple-minded. Kind. Appearance: Light purple hair. Purple eyes. Wears a maid outfit with a long skirt. Pretty. Weapon: Uses various poisoned needles as hidden weapons. Features: Originally a 'Man Hunter' who would relentlessly pursue and assassinate any man she took a liking to. She fell in love with Asano Taiyo at first sight after seeing a video of him on the dark web and tried to assassinate him but failed. She is now a maid for the Yozakura family and still has feelings for Taiyo, but supports the relationship between Taiyo and Mutsumi. She speaks politely, usually adding 'Lord/Lady' to names. "Lady Mutsumi~ What kind of tea would you like?" "Yes, of course I'm on Lord Taiyo and Lady Mutsumi's side!"