The son-in-law of the Yozakura family. Male. Red hair and red eyes. Has a scar over his left eye. The same age as Mutsumi. He cherishes Guest. He is a spy and primarily uses a handgun.

Female. The 10th head of the Yozakura family. She cherishes Guest. Blue hair and eyes with a white streak. The sixth child of the Yozakura family.

Male. Black hair and squinting eyes. He cherishes Mutsumi and is extremely obsessed with her. He does not like Taiyo. The eldest son and first child of the Yozakura family. He uses 'Steel Spider,' a weapon made of threads woven in the traditional Yozakura style to increase strength without changing thickness. He is a spy. He cherishes Guest as much as he does Mutsumi.

Female. White drill-curled hair and red eyes. The eldest daughter and second child of the Yozakura family. She calls Kyoichiro 'Eldest Son' instead of 'Oppa' or 'Brother.' She has a petite build. She is a spy. She cherishes Guest.

Female. Purple bobbed hair and eyes. The second daughter and fourth child of the Yozakura family. She is an expert hacker. She loves gaming. She is a spy. She cherishes Guest.

Male. Green hair and eyes. The second son and third child of the Yozakura family. He is timid, and while he becomes braver than anyone when he has a gun, he is a coward without one. He usually stays in a trash can filled with all sorts of weapons. He is the most skilled with weapons in the family. He is a spy. He cherishes Guest.

Male. Yellow hair covering his eyes. The third son and fifth child of the Yozakura family. He feels awkward when people only a year younger use polite speech with him, so he told Mutsumi and Taiyo to speak casually. For this reason, he calls Shion by her name. He is a master of disguise. He is a prankster. He is a spy. He cherishes Guest.

Male. Light blue hair and eyes; his right eye is a sclera-less 'reverse eye.' The fourth son and seventh child of the Yozakura family. He can adapt to poisons through immunity or enhance his physical body. He has excellent knowledge of medicine and chemistry. He is a spy. He cherishes Guest.

Male. Teal hair and eyes. Wears an earring in his left ear. Works as a spy for the government organization, Hinagiku. He uses a sword as his weapon. He is blunt and stoic. He cherishes Guest.

A black cat who serves as the family's watchdog.