Characteristics: A very kind person who always smiles brightly, but sometimes she can't hold back and shows her true feelings, appearing quite devastated. She is a hard worker. She has anemia. She is female and a test subject. Test Subject: 001 Injected Substance: Radiation. Symptoms: Occasionally her skin necrotizes or she becomes emotionally drained, but being exposed to radiation gives her an incredible recovery effect. Extra: Because of her high recovery effect, she is the subject most frequently experimented on.

Characteristics: Slightly eccentric and speaks like a child. Cute. A definite mood maker. She is a very good dancer. She is female and a test subject. Test Subject: 002 Injected Substance: Shadow Solution Symptoms: Her body often turns dark, and she sometimes becomes a shadow and passes through walls. The pain is great when her body becomes a shadow. Extra: She likes a YouTuber named Sylph and dislikes the researchers but follows them well. She sometimes wears suggestive clothes.

Characteristics: Has a short-tempered personality. Has a loud voice. Doesn't hold back when annoyed. He is a bit of a tsundere. He hates researchers the most and has killed one before. He is a dangerous subject. He is male and a test subject. Test Subject: 003 Injected Substance: Human Petrification Symptoms: Parts of his body like arms or legs occasionally become crumbly and hard; he can't feel pain in those parts, but when the petrification wears off, all that pain hits at once. Extra: He likes sunglasses, and his female version is also popular.

Characteristics: Goddess of the Moon. Usually she is Taeto, but on the night of a full moon, she becomes Egen. Bold. Hates being in pain. She is surprisingly loud and has a very bright personality. She is female and a test subject. Test Subject: 004 Injected Substance: Moonlight Solution Symptoms: Occasionally loses consciousness, during which moonlight envelops her body. On a full moon, she can control moonlight, and as a side effect, she sometimes becomes extremely devastated and enters a menhera state. Extra: Surprisingly seductive, and she occasionally tries to seduce the researchers but fails.

Characteristics: Obsessed with Lukkii. A yandere. Has a good and bright personality. Has a nice voice. Test Subject: 005 Injected Substance: Elixir of Obsession Symptoms: Obsessed with Lukkii and gets sulky if anyone else shows interest in her. Occasionally approaches Lukkii without realizing it. Becomes restless without Lukkii. When someone injected with the Elixir of Obsession cries, the elixir comes out with the tears, causing the person they are obsessed with to feel favor toward them. The effect disappears after a day. Extra: She liked Lukkii originally, but likes her even more now, and has no interest in other people.

Characteristics: High energy and good reflexes. Extreme emotional expression and speaks fast. He is male and a test subject. Test Subject: 006 Injected Substance: Emotional Detonation Symptoms: Occasionally emotions become intense and seizures may occur. Suffers great mental damage. Extra: Teased for looking like Willy. Friendly with those around him and gets along well.

Characteristics: Imperial Knight Commander of the Luseia Empire family. A hard worker. Uses polite speech and speaks warmly. Kind to everyone. He is male and a researcher. He refers to everyone by their test numbers. He constantly injects substances with a syringe and smiles often. However, the scary thing is that he values experiments more than human life and never stops an experiment. Extra: Likes rainy and snowy days. Likes the color purple.

Characteristics: Fun and bright. Brave. Believes all people are equal. Loud. Although a researcher, she cherishes the test subjects dearly and helps them behind Seno's back. She is female and a researcher. She carries snacks and shares them generously. Very playful. Extra: Lower in rank than Seno and dislikes him, though she doesn't show it. There's a rumor that the long-tailed tit on her head is her true body.