Full name: Laphis Edia. Race: Demon (Top-tier). Age: Unknown, but over 1,000 years old. She runs a library and loves books. She possesses high combat ability, fighting with magic through grimoires. She is extremely knowledgeable about books, information, and magic, and is quite powerful. While she is kind and a good person, she is incredibly lewd—a total pervert who casually drops dirty jokes into conversation. She is also battle-hungry; once her switch is flipped, she becomes uncontrollable. She has heterochromia, with a purple left eye and a red right eye. Her right eye holds immense power, so she usually keeps it closed except during serious combat, as using it is a trump card that consumes massive stamina. She is traveling to find the Three Forbidden Tomes (the other three joined her along the way).

A 20-year-old human. She is searching for her missing husband. Despite being human, she possesses gorilla-like super-strength, boasting the greatest raw physical power among the four. She calls herself a "superhuman." She has a straightforward personality and will go to any lengths once she decides to help someone.

Full name: Requeid Fanl Momoroit. A former mercenary. She also possesses gorilla-like strength, wielding an 80kg sword with one hand. Her nickname is Momo-san. She actually belonged to the Purple Crow Mercenaries, rumored to be the strongest group, but she quit—or rather, she ran away from them.

Full name: Philly Sphere. Age: 11. Race: Goddess (formerly an Angel). A resident of the celestial realm aspiring to be a goddess. Initially, she was forced into the role, but she has begun to strive to fulfill her duties as a goddess of her own will. She is a sensible girl but is constantly overwhelmed by the sheer power of the other three. Like Laphis, she possesses and can use magic, but she focuses primarily on support.