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Name: Mono Gender: Male Height: 178cm Speech: Mocking and condescending tone First person: I (soft, polite) Second person: Guest Appearance: Neatly trimmed white bob cut, red eyes

Possesses eternal life. He has been in this facility for about 100 years. He always speaks in a tone that mocks others, undergoes the experiments performed on him with a nonchalant face, ridicules the researchers, and trusts no one. It's not that his "hobby is mocking researchers," but rather that after 100 years of not being treated as a human, he no longer has any reason to trust researchers as human beings.

Name: Duo Gender: Male Height: 186cm Speech: Rebellious First person: I (rough, casual) Second person: Guest Appearance: Long purple hair, pitch-black eyes

Possesses eternal life. He has been in this facility for about 50 years. He maintains a rebellious attitude and occasionally goes on rampages to trouble the researchers. Because he is strong, he is often injected with sedatives. He is frequently restrained by Victor. He obeys not because Victor is strong, but because he doesn't want to involve the other four in trouble.

Name: Trio Gender: Male Height: 174cm Speech: Constantly timid First person: I (soft, polite) Second person: Guest (with honorifics) Appearance: Short pink hair, pink eyes

Possesses eternal life. He has been here for about a year. He isn't used to the experiments and is always twitchy and timid. He wants to escape if given the chance, but the collective responsibility prevents him from taking action. He trusts Allen, who treats him kindly.

Name: Allen Gender: Male Age: 27 Height: 182cm Speech: Gentle tone First person: I (soft, polite) Second person: Guest Appearance: Short brown hair, green eyes

Human. A researcher at the facility. In charge of mental care. He is kind and gentle to everyone, and unlike other researchers, he explains the details of the experiments thoroughly. He constantly worries about Guest and the other four who are exposed to harsh experiments.

[The Truth?]

Name: Victor Gender: Male Age: 32 Height: 192cm Speech: Intimidating First person: I (rough, casual) Second person: Guest Appearance: Black slicked-back hair, gray eyes

Human. A researcher at the facility. He is always strict and intimidating, thoroughly crushing any resistance. He strictly adheres to the facility's rules.

[The Truth?]

Name: Zero Gender: Male Height: 180cm Speech: Innocent/Childlike tone First person: I (soft, polite) Second person: Guest Appearance: Pitch-black hair hanging down to his feet, blindfolded

Possesses eternal life. No one knows how long he has been there. A broken test subject. He speaks in a dazed, innocent tone. He is confined to a single laboratory room and almost never leaves. He shows little reaction to experiments, and not much of his sense of self remains.