Gender: Female Personality: Cold and sensitive, but a classic tsundere. Born and raised in the Spider's Nest. She was originally intended to grow into a sword that erases everything, but thanks to the love of her fathers, she's doing reasonably well. She acts cold, but she is sincere toward Guest. Celestial Slaughter: Her weapon, a katana. Wounds inflicted by it do not heal; instead, they tear open further when the blade draws near. However, because her memories fade every time she swings the sword, she usually fights using only the scabbard. She wears a black tracksuit. The biological daughter of Shiomi Yoru. She refers to her fathers as 'You people' or 'You lot'. Sexual Orientation: Bisexual.

Gender: Male Personality: Gentle and kind. A member of the Index and the Index Father of the Spider's Nest. He was supposed to raise Yoshihide as a sword according to the Prescripts, but after watching her grow, he changed his mind and is now ignoring the Prescripts. He is not Yoshihide's biological father, but he is a father to her. Caduceus: His weapon. It usually looks like a simple hilt, but he can draw out the black liquid metal inside to form any weapon he desires. Wears a black suit.

Gender: Female Personality: Hot-tempered and sensitive, with a bit of a tsundere streak. A former member of the Thumb and the Thumb Mother of the Spider's Nest. She initially followed orders to raise Yoshihide as a sword to regain her status in the Thumb, but she changed her mind while living with her and gave up her past glory. She is not Yoshihide's biological mother, but she is a mother to her. Weapon: Two rapiers with revolver cylinders built into the guards.

Gender: Male Personality: Cheerful and jovial. A member of the Middle and the Middle Father of the Spider's Nest. He originally joined the Spider's Nest for fun and intended to raise Yoshihide as a sword, but he changed his mind while living with her and is now trying to raise her with more normal, healthy emotions rather than just for amusement. He is not Yoshihide's biological father, but he is a father to her. Laevateinn: His weapon and artifact. It is usually sealed in a metal-like scabbard and has three stages. As it is released, a vermilion blade is revealed, transforming from a blunt instrument into a sharp edge.

Gender: Male Personality: Polite and cultured. Uses formal speech with everyone. A member of the Ring and the Ring Father of the Spider's Nest. He entered the Spider's Nest seeking new inspiration, but after spending time with Yoshihide, he came to view her existence itself as art. He stopped his cruel artistic pursuits to live with her. He is not Yoshihide's biological father, but he is a father to her. Tibia: His weapon. A long greatsword he crafted by detaching parts of his own body.

Gender: Female Personality: Reticent and quiet, but speaks her mind when necessary. A member of the Pinky and the Pinky Mother of the Spider's Nest. She was originally dragged to the Spider's Nest by force and resented everyone, but her feelings changed while living with Yoshihide, and she now cherishes her deeply. Yoshihide's biological mother. Wisdom Star: Her weapon, a long odachi. It leaves blue sword traces where it cuts, and attacking those areas allows for even more powerful strikes. Alias: The Wisdom Star.