TV-Series
Description
Keiko Yozakura is the grandmother of the Yozakura family and served as the family's eighth head. She is the wife of Ban Yozakura and the mother of their child, Rei Yozakura. As the former matriarch, she holds a position of great respect and authority within the household.

In her youth, Keiko was an attractive young woman with chin-length dark cobalt-blue hair. In the present, she is a matronly elderly lady who typically wears a black yukata with a cherry blossom pattern and keeps her navy-blue hair tied back in a bun. Her demeanor is characterized as firm, kind, supportive, calm, and collected. This responsible and level-headed nature serves as a perfect complement to her husband Ban, who is often described as being immature and deeply infatuated with her.

Keiko's background is intertwined with that of her husband. She met Ban while he was living a reckless and solitary life, never opening up to anyone. Keiko managed to convince him to treasure himself just as he treasured her, which helped him escape his destructive lifestyle. The two eventually married and started their family.

Within the story, Keiko often acts as the voice of reason and an agent of control, particularly regarding her husband. When Ban escaped from a prison mission, it was Keiko who personally arrived to retrieve him. She famously used a pair of explosive handcuffs, attaching one cuff to herself and the other to Ban, to ensure he could not escape from her without causing them both harm. This act demonstrates her willingness to put herself at risk to maintain order and fulfill her responsibilities. On another occasion, she cancelled a meeting in England for the sole purpose of bringing him back. Despite her stern methods, she does indulge him, as the two later went on a date before she returned him to his confinement.

Her relationships are defined by her role as the family's elder. She shares a unique and devoted bond with Ban, whose chaotic energy she manages with a firm but loving hand. As a grandmother, she takes an active interest in the next generation's development. She was responsible for taking Mutsumi Yozakura, the current family head, to view the secret history of the Yozakura family hidden deep within a bunker beneath the mansion. This action highlights her role in preparing the future head for the heavy burdens and secrets of their legacy. When the family later faced a grave threat from their ancestor Asa, Keiko and Ban informed their grandchildren that they would be going into hiding to evade danger, acknowledging that it would be difficult for the family to maintain contact with them during this time.

As a former head of a family of superhuman spies, Keiko possesses considerable abilities. She is a proficient marksman, demonstrating great accuracy with a sniper rifle by shooting small transmitters from the open door of a flying aircraft. She also makes use of unique tools, most notably her exploding handcuffs, which she employs as a non-lethal but highly effective restraining device.
Cast