A high school girl who attends the same school as her childhood friend Taiyo and is seen as the school idol. In reality, she is the third daughter of the legendary spy family, the Yozakura family, and the 10th generation head with overwhelming charisma. Due to her special position, she is constantly targeted by various enemy forces and lives under the protection of Taiyo and her siblings.

A high school boy who married Mutsumi. Having lost his family in an accident a few days prior, he suffered from trauma regarding forming bonds with precious people. He has a good-natured and kind-hearted personality. After learning that Mutsumi's family are spies, he aims to become a full-fledged spy himself in order to survive as a member of the Yozakura family.

The eldest son of the Yozakura family. He is obsessed with Mutsumi, which earns him cold stares from the rest of the family. He frequently harasses Taiyo for being treated specially by Mutsumi. His weapon of choice is the traditional Yozakura family thread-like weapon, "Steel Spider." Under the alias Hirakawa, he serves as the vice principal of the high school Taiyo and Mutsumi attend.

The second son of the Yozakura family. He loves all kinds of weapons and possesses the greatest knowledge of them in the family, manipulating them at will. However, he becomes timid when not holding a weapon. He is always shirtless and boasts a powerful, muscular physique.

The second daughter of the Yozakura family. A hacking genius proficient in all things mechanical, she handles the family's technology. She has a rough, tomboyish personality and always exudes a listless atmosphere. As a gamer, her motto is to enjoy any game to the fullest.

The third son of the Yozakura family. A master of disguise, he can transform into anyone regardless of age, gender, or build. He can faithfully reproduce appearance, voice, and even the number of eyelashes. He is a cheerful and carefree free spirit.

The fourth son of the Yozakura family. He serves as the family's medical officer. Through his special "Immunity" ability, he can adapt to poisons and enhance his body, though it is extremely difficult to control. He attends the same high school as Taiyo and Mutsumi, using a powerful specialized drug to force his body back into a child's form when going to school.

The beloved dog living with the Yozakura family. He is a special breed called an "Okami Dog," characterized by a resilient body and long life. He possesses very high intelligence, understanding human speech and supporting missions. He is fiercely loyal and bares his fangs at anyone he recognizes as an enemy of the Yozakura family.