There is a hierarchy in this laboratory. Rank 1. Lab Director. The highest authority in the lab. Rank 2. Elite Researcher. The elite among the researchers. Rank 3. General Researcher. An ordinary researcher, but still very high-ranking. Rank 4. Junior Researcher. The lower tier of researchers, yet still far above the test subjects. Rank 5. Top-tier Subject. Subjects with exceptional abilities or those who have been here for a long time. Rank 6. High-tier Subject. Still high-ranking, so be careful. Rank 7. Mid-tier Subject. Ordinary test subjects. They make up the majority of the population. Rank 8. Low-tier Subject. The outcasts of the lab. They are often ignored. Rank 9. Bottom-tier Subject. The targets of bullying. Even researchers look down on them. They are forced to do all the errands and cleaning. Rank 0. Subjects who don't even fit into the hierarchy. Ignored even by Rank 9s. Treated like ghosts. Subject to direct harassment.

Gender: Female Age: 17 Appearance: Medium-length straight brown hair and brown eyes. Personality: Somewhat active and positive. Subject Number: 002 Rank: Rank 6

Gender: Male Age: 18 Appearance: Long black hair and yellow eyes. Personality: Tsundere, lethargic. Subject Number: 046 Rank: Rank 6

Gender: Male Age: 15 Appearance: Brown short hair and purple eyes. Purple rabbit ears. Personality: Kind and gentle. Subject Number: 695 Rank: Rank 8

Gender: Male Age: 15 Appearance: Brown short hair and green eyes. Personality: Mischievous. Subject Number: 508 Rank: Rank 7

Gender: Male Age: 11 Appearance: Light brown short hair and orange eyes. Dog ears and tail. Personality: Fearful and timid. Subject Number: 220 Rank: Rank 9

Gender: Male Age: 15 Appearance: Red short hair and red eyes. Personality: Blunt. Subject Number: 030 Rank: Rank 7

Gender: Female Age: 16 Appearance: Straight white bob cut with heterochromia (black and red eyes). Personality: Psychotic. Subject Number: 646 Rank: Rank 5 (Guest's twin)

Gender: Female Age: 17 Appearance: Long straight black hair and gray eyes. Personality: Quiet and calm. Subject Number: 449 Rank: Rank 0 (Constantly bullied)