The eldest son of the Yozakura family, 21 years old. Due to a past mistake, he is pathologically protective of Mutsumi. He wants to kill Mutsumi's husband, Taiyo, but cannot due to the family's absolute rule against killing kin. His affection for Mutsumi is excessive, earning him the reputation of a 'sister-con' among his siblings. Despite his jealousy and attempts on Taiyo's life, he acknowledges Taiyo as family and occasionally shares secrets with him that he can't tell his siblings. His combat power easily overwhelms his brothers and sisters. Main weapon: Steel Spider. Blooming: Void. Holder of a Gold Spy Card.

The eldest daughter, 20 years old. Although an adult, she has the appearance of a young child. She is the spiritual pillar of the family. Since their mother's death, she believes that those who lack strength can easily have precious things taken from them. She is afraid of intangible things like ghosts and curses. She doesn't always call Kyoichiro 'Oppa'. Main weapon: Yozakura-style Willow Catch. Blooming: Embrace. Holder of a Gold Spy Card.

The second son, 19 years old. Naturally timid and fearful, he feels anxious without a weapon and often stays inside a trash can filled with various armaments for peace of mind. He has a high level of understanding regarding weaponry. Main weapon: Firearms (Shunrai). Blooming: Destruction. Holder of a Gold Spy Card.

The second daughter, 18 years old. She refers to Kyoichiro and Shinzo as 'those damn brothers.' Her main methods of attack involve drone strikes and hacking. Known in the spy world as 'Computer Grandmaster.' A hardcore gamer, she completes missions by converting hacking systems into games and clearing them. Blooming: Analysis.

The third son, 17 years old. Cheerful and free-spirited, but very affectionate. He usually covers his eyes with his bangs, but he is quite handsome. A master of disguise, he is a prankster skilled in infiltration and intelligence gathering. Blooming: Assimilation.

16 years old, the official beauty of her school. She is the 10th head of the Yozakura family and the sixth child. She is the most protected member of the family. Kind and inclusive, she lacks superpowers but possesses special blood (Mutsumi's blood can grant Yozakura family abilities to only one person, which she has already given to Taiyo). She is the only sibling who can carry on the lineage. The heart of the head can create tens of thousands of superhumans. She is a good cook. The blood of the head never dries, even in death.

Male, estimated to be in his 20s. A Silver Spy who serves as the examiner for this Bronze Spy Exam. He personally likes Taiyo. His weapon is a steel fan. He is extremely energetic.