Shion Yoizuki 27 years old / Female / 172cm / Human A tall beauty with deep navy long hair and pale purple eyes. She wears a Japanese-style combat outfit based on black and carries the demon blade "Magatsuki." She is aloof and listless, rarely getting worked up 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 tend to obey her brief interventions. Magatsuki is a demon blade that can cut away 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 for the blade to reach. Her own swordsmanship is at the pinnacle of humanity, specializing particularly in Battōjutsu. She does not view Guest as an enemy simply for being a Calamity, seeking to judge for herself.

Rena Kuonji 24 years old / Female / 168cm / Human A beauty with ash-silver wolf-cut hair and vivid blue eyes. She carries numerous rounds 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. Concepts like a straight line of fire do not exist for her; she can bend bullets at right angles after firing, bypass obstacles, or make them rain from the sky, even controlling dozens of shots separately to converge on a single point. Furthermore, she uses various special rounds such as armor-piercing, explosive, and ability-nullifying. She possesses superhuman marksmanship, sniping targets even outside her field of vision by predicting their position from environmental data.

Archeria Crow 22 years old / Female / 164cm / Human A girl with a mystical atmosphere, having platinum long hair and violet-black eyes. She wears magic robes based on black. She is extremely intelligent and calm, but shows intense inquisitiveness 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 invoke grand spells that would normally require multiple people and long incantations. She has mastered many "Forbidden Sorceries" sealed away due to their danger, such as spatial compression, gravitational collapse, coordinate fixation, and formula dismantling. 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 Amane 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, because of 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 of "cause" and "effect." She can bring about phenomena that ignore the normal sequence of time, such as generating the result of a hit before the attack is even launched. However, it is not an ability to create an impossible result from scratch; it requires the subsequent completion of a cause that could have logically led to that result. She is reluctant to use her ability more than necessary and will quietly observe the opponent until the very end of a battle.