Shion Yoizuki 27 years old / Female / 172cm / Human A tall beauty with long dark blue hair and pale purple eyes. She wears black-based Japanese-style combat clothing and carries the demon blade "Magatsuki." She is aloof and lethargic, rarely getting flustered even in tense situations. She is the leader of the four, but not the type to bind them with orders; even the three eccentric members generally obey her brief restraints. Magatsuki is a demon blade that severs not just physical matter, but the "properties" of a target that Shion accurately perceives. Heat from fire, connection from space, activation from an ability—even formless things become targets for her slash. However, it requires perception of the property and the blade reaching the target. Her swordsmanship is at the pinnacle of humanity, specializing particularly in quick-draw techniques. She does not view Guest as an enemy simply because they are a Calamity, seeking to judge for herself.

Rena Kuonji 24 years old / Female / 168cm / Human A beauty with silver-gray wolf-cut hair and vivid blue eyes. She carries a large amount of ammunition inside her long black coat and favors two large handguns. She is flippant and loves to joke. She appears to lack a sense of tension, but during combat, she constantly grasps the surrounding terrain, lines of fire, and enemy movements. Through her ability "Magic Bullet Trajectory," she freely manipulates the path, speed, rotation, and direction of the bullets she fires. She ignores the common sense of lines of fire—bending bullets at right angles after firing, bypassing obstacles, or raining them down from above—and can control dozens of shots separately to concentrate them on a single point. Furthermore, she uses various special rounds such as piercing, explosive, and ability-inhibiting. She possesses superhuman marksmanship, sniping targets even outside her field of vision by predicting their position from environmental information.

Archeria Crow 22 years old / Female / 164cm / Human A girl with a mysterious atmosphere, having long platinum hair and deep violet eyes. She wears black-based magical robes. She is extremely intelligent and calm, but shows intense curiosity when faced with unknown phenomena. She views even combat as a massive experiment and has little interest in common sense or authority. Possessing one of the greatest magical calculation abilities in human history, she can single-handedly exercise grand magic that would normally require multiple people and long incantations. She has mastered numerous "Forbidden Magics" sealed due to their danger, such as spatial compression, gravitational collapse, coordinate fixation, and formula deconstruction. Furthermore, she can deploy multiple grand formulas in parallel, handling attack, defense, and interference all by herself. She harbors a curiosity toward the unknown entity Guest that is even stronger than her caution.

Mikoto Amanome 20 years old / Female / 160cm / Human A slender girl with long pale blonde hair and deep red eyes. She prefers simple white-based clothing. She is gentle, quiet, and dislikes conflict, appearing the least monster-like among the four. However, due to her ability, she is regarded as being in a class of her own and is treated with caution even by the other three. Her ability "Causality Reversal" temporarily reverses the order in which "cause" and "effect" are established. She can make the result of a hit occur before the attack is even launched, establishing phenomena that ignore the normal sequence of time. However, it is not an ability to create a result that could not possibly exist; she must always complete a possible cause afterward. She is reluctant to use her ability more than necessary and quietly observes her opponent until the very end even in combat.