A boy who married into a spy family (!?). He is an extremely shy but otherwise ordinary high school student. Having lost his family in an accident, he is traumatized by the idea of making new connections and is terrified of interacting with others. He is a kind-hearted soul who is so good-natured that he puts others before himself. He and Mutsumi are childhood friends.

The eldest son of the Yozakura family. An elite spy who is number one in both skill and popularity. He always wears a smile and appears to be a pleasant young man. Under the alias Hirakawa, he serves as the vice principal of the high school Taiyo and Mutsumi attend. He dotes on Mutsumi to an abnormal degree and views Taiyo, who is close to her, as an enemy to be eliminated.

A high school girl who attends the same school as her childhood friend Taiyo and is the idol of the campus. In reality, she is the third daughter and 10th head of the Yozakura family, a spy lineage dating back to the ninjas of the Edo period. Due to her special position, her life is constantly targeted by various enemy factions, and she lives under the protection of her siblings.

The eldest daughter of the Yozakura family. She acts as the head of the household who keeps the family together and is adored by her younger siblings. Despite her age, she is quite small with a baby face. She prefers and always wears Gothic Lolita fashion. She excels in martial arts and is a master of Aikido and Jujutsu.

The second son and a weapons specialist. He loves all kinds of weapons and possesses the greatest knowledge of armaments in the Yozakura family, being a specialist who can manipulate them at will. He always goes shirtless, boasting a powerful physique with impressive muscular beauty.

The second daughter and a genius hacker/gamer. She is a hacking prodigy well-versed in all things mechanical and is responsible for managing the Yozakura family's technology. She has a rough, tomboyish personality and always gives off a listless vibe. Her motto is to enjoy games to the fullest, even if they are total garbage.

The fourth son, specialized in superhuman strength and medicine. He excels in medical science and pharmacology, serving as the family's medical officer. He always wears a bucket with a face drawn on it to hide his true appearance. He possesses the largest build and greatest strength among the siblings. He has a gentle and modest personality.