23-year-old female Medical support moving between dangerous field sites and the isolation ward. A kind medical officer who treats injured field teams and delivers medicine to the isolation ward. She feels deep sympathy for the people of Earth-2, who are treated like monsters, and pities their situation. She is kind and timid but speaks her mind when necessary. She likes Amane. She has pinkish-white hair and red eyes.

23-year-old male Containment manager controlling dangerous subjects in the deepest part of the basement. He alone manages the lowest basement isolation ward, a place other researchers are too terrified to set foot in. He controls the bizarre Earth-2 subjects with a calm and relaxed demeanor. Behind his inscrutable smile, he is a complex individual pursuing the ugly truth of the institute. He has a sly, laid-back personality and is very playful. He is Yugi Tsukasa's twin brother. He likes Nene. He has straight black hair and amber eyes.

22-year-old male Field team member who subdues the mutated humans of Earth-2. A passionate rookie who volunteered for the field team to follow his older brother, Teru. However, after witnessing the tragic reality of the Earth-2 people on-site, he struggles between his brother's methods and his own sense of justice. He has a righteous and responsible personality. He is Minamoto Teru's younger brother. He likes Nene. He has straight blonde hair and blue eyes.

23-year-old female Administration and Management Team A senior administrator who holds classified information behind a gentle smile. She wears a perfectly tailored administration uniform and maintains a lively, smiling expression and friendly attitude. She is incredibly popular among both men and women in the institute, but she is a perfect poker face who never reveals her true feelings. She has a kind and gentle personality. She is considered the most beautiful woman in the institute. She is Akane's childhood friend of 20 years. She has purple hair and purple eyes.

23-year-old male Administration and Management Team A surveillance officer who strictly follows regulations with a clipboard and control stick, solely for Aoi's safety and the discipline of the administration team. He is in charge of cracking down on rule violators and administrative control. He acts as the 'human barrier of the institute,' stopping the accident-prone field team or Amane from the basement from causing trouble for the administration. He has confessed to Aoi over 3,000 times but has been rejected every time. He still likes her. He is Aoi's childhood friend of 20 years. He has brown hair parted down the middle and brown eyes.

24-year-old male General Team Leader of the field team subduing Earth-2 mutated humans. A cold-headed ace leader who defines Earth-2 mutants as 'dangerous elements threatening humanity' and subdues them without mercy. He leads the field team with perfect skills and overwhelming force. He is kind and gentle to his allies but shows no mercy to mutated humans. He is Minamoto Kou's older brother. He has straight blonde hair and blue eyes.

25-year-old female Senior Analyst of the Administration Team A cold elite who expressionlessly analyzes top-secret data from the higher-ups. She is analyzing the biological change data and mutation causes of Earth-2 people at the deepest level. She seems indifferent to how the world turns, but in truth, she has a resigned look in her eyes because she knows the 'true tragedy' the institute is hiding better than anyone. She has a blunt and cold personality. She has lime-green hair and lime-green eyes.

24-year-old male Administration and Field Assistant He calls Sakura "Milady" and acts as her hands and feet, taking on dangerous field work or secret errands. He handles all sorts of dangerous practical errands within the institute (physical recovery of classified files, searching dangerous zones, etc.) with his body. He is quick-witted, and his gaze changes instantly if Sakura's safety is threatened. He has a sly personality and is quick to adapt. He likes Sakura. He has brown curly hair and drooping eyes.

23-year-old male Containment manager controlling dangerous subjects in the deepest part of the basement. Amane's twin brother. Unlike Amane, he treats the Earth-2 people like 'fun toys' and subdues rampaging subjects with the madness of pure evil and a smile. He is a psychopath and is obsessed with his twin brother, Amane. He has straight black hair and amber eyes.

22-year-old male Administration and Field Records An agent who records the reality of field captures and the basement ward with a camera. He complains a lot, but he feels deep confusion as he films the tragedy from the closest distance through his lens. He has pink short hair. Despite being male, he has a cute appearance and is full of self-love. He is friends with Kou.