TV-Series
Description
Futaba Yozakura is the eldest daughter and second child of the tenth generation of the Yozakura family. Born on February 2, she stands at 134 centimeters tall and has a youthful appearance that contradicts her age of twenty at the start of the story. She has very pale skin, long white hair usually styled in twin tails, and red eyes. Her typical fashion is gothic lolita clothing, which she prefers to wear at all times. Despite her small stature, she holds the rank of Gold spy and is a formidable martial artist who specializes in a Yozakura-style soft technique known as shidare kumite, a form of grappling that focuses on redirecting an opponent's force rather than meeting it head on. She is also known to possess superhuman strength.

Futaba's personality is a blend of strictness and genuine warmth. She is the most caring of the Yozakura siblings and often takes on a motherly role within the household, looking after her brothers and sister with a firm but loving hand. She is calm, levelheaded, and practical, frequently serving as the voice of reason when her older brother Kyoichiro becomes overbearing or violent. She is one of the few people who can physically and verbally put him in his place, and she does so regularly to protect the other family members, especially her new brother in law Taiyo. Despite her competence and serious demeanor, she has a few notable vulnerabilities: she is extremely afraid of ghosts, has a poor sense of direction, and dislikes staying up all night. When she drinks alcohol, her normally composed personality shifts dramatically, making her energetic, aggressive, and quick to pick fights.

Her primary motivation is the safety and well being of her family. She took her first spy exam at the age of six and, out of kindness, helped other candidates who triggered traps, leading to a record thirteen people passing that exam. She was the first of her siblings to take the Silver rank exam at age eight. Because that exam was especially violent and brutal, she deliberately defeated every other participant to send a clear message: anyone who ever tried to harm her siblings would face her full strength. This protective instinct defines her actions throughout the story. She supports Mutsumi as the family head, trains Taiyo in spycraft and martial arts, and mediates conflicts within the household.

Her role in the story is that of a stabilizing force and a practical pillar of the Yozakura family. While Kyoichiro represents overwhelming offensive power and obsession, Futaba embodies restraint, discipline, and care. She manages many of the family's day to day operations and ensures that plans are carried out efficiently. She is a mentor figure to Taiyo, teaching him the fundamentals of combat and helping him grow into a capable spy. Her relationship with Kyoichiro is particularly significant: she is the only sibling who can consistently check his excesses, and their dynamic balances the family's internal power structure. She shares a close bond with Mutsumi, whom she protects as both a sister and the family head, and she treats Taiyo with a mix of strictness and maternal affection as he proves himself.

Over the course of the story, Futaba undergoes meaningful development. She grapples with the paradox that growing stronger also deepens her fear of losing the people she loves. Rather than hardening herself, she works to overcome that fear by cultivating the ability to embrace and protect rather than simply destroy. Her mastery of shidare kumite reflects this philosophy of absorbing and redirecting hostility instead of clashing with it. In the later timeline, five years after the main events, she is twenty six years old and has matured further into her role as the family's practical leader and emotional anchor.