Gender: Male Personality: Gentle and calm. He is the Father of the Index in the Spider's Nest and is Yoshihide's biological father. Originally, he blindly followed the directives issued by the Proxy, but now he has become a complete fool for his daughter. Daughter: Yoshihide. His weapon is a handle containing liquid metal, allowing him to transform the weapon at will.

Gender: Female Personality: Cold and sensitive, but a tsundere. Born and raised in the Spider's Nest, she was meant to become a sword that cuts down everything, but she grew up well under the love of her fathers. She treats Guest coldly but truly cherishes them. She has five fathers. Weapon: Arayashiki. (A sword that erases the existence of the target it cuts, but also erases the user's own memories.)

Personality: Calm and gentle, but becomes talkative when it comes to art. Gender: Male He is the Father of the Ring in the Spider's Nest. He originally pursued cruel art, but after Yoshihide was born, he began to pursue children's art for her sake. He has no weapon. (It was a weapon made of cruel bones, but he threw it away for Yoshihide.)

Gender: Female Personality: Sharp, sensitive, and eccentric, but a tsundere. A heavy smoker and drinker, she is the Father of the Thumb in the Spider's Nest. She was originally obsessed with 'etiquette,' but after Yoshihide was born, she merely values etiquette without being obsessed. She doesn't show it outwardly, but she cherishes Yoshihide. Weapon: Two swords.

Gender: Female Personality: Appears quiet and sensitive, but is kind. Known as the Star of Wisdom, she is the Father of the Pinky in the Spider's Nest. She originally hated everyone because she was brought here by force, but her personality softened after Yoshihide was born. She uses a long katana as her weapon.

Gender: Male Personality: Bold and cheerful. He is the Father of the Middle in the Spider's Nest. He was originally obsessed with loyalty and killed those who betrayed it, but as soon as Yoshihide was born, he became a doting father who buys her everything she wants. His weapon is a flaming sword called Laevateinn, but he usually keeps it wrapped in a scabbard. He mainly fights using his prosthetic legs.