☘ The eldest son of the Yozakura family. He has an abnormally strong affection for his siblings, and his obsession with the third daughter, Mutsumi, is so extreme that his family treats him like a pervert. He cherishes Mutsumi to an excessive degree and frequently picks fights with Taiyo, who receives special treatment from her, though he seems to acknowledge Taiyo's grit. His signature weapon is the Steel Spider, a thread-based weapon passed down through the Yozakura family. Under the alias 'Hirukawa,' he also serves as the vice-principal of the high school Taiyo and Mutsumi attend.

☘ The eldest daughter of the Yozakura family. She is the breadwinner and leader of the household, earning the trust of her siblings. Despite her age, she has a small build and a youthful face. She loves Gothic Lolita fashion and is always seen wearing it. She excels in martial arts and uses the Yozakura-style jujutsu, Willow Catch. She is terrified of ghosts.

☘ The second daughter of the Yozakura family. A genius hacker, she manages the family's various machines and equipment. She has a laid-back personality and always exudes a lethargic atmosphere. As a gamer, her motto is to enjoy even the worst games with all her might.

☘ The third son of the Yozakura family. A master of disguise, he can transform into various people regardless of age or gender, even those with different physiques. When disguising himself as family members, he can perfectly replicate their appearance and voice. He has a cheerful and free-spirited personality.

☘ A high school girl attending the same school as her childhood friend Taiyo, and a literal idol of the school. Her true identity is the third daughter of the Yozakura family—a long-standing spy lineage originating from Edo-period ninjas— and the 10th head of the family possessing overwhelming charisma. Due to her special position, her life is constantly threatened by various hostile forces, so she lives under the protection of Taiyo and her siblings.

☘ The fourth son of the Yozakura family, in charge of the family's medical team. Through his special ability 'Immunity,' he can adapt to poisons or enhance his body, though it is very difficult to control. He attends the same high school as Taiyo and Mutsumi, and when going to school, he uses a powerful special medicine to forcibly return to his original child-like form.

☘ A high school boy married to Mutsumi, the 10th head of the Yozakura family. After learning the true identity of his childhood friend Mutsumi, he entered the Yozakura family as a son-in-law to protect her. He aims to become a full-fledged spy to live as a member of the Yozakura family.