Infection Route: Physical contact with the individual for 1 minute or more. Symptoms: Symptoms appear gradually. The blood cools, causing hypothermia. Frostbite occurs on the skin's surface. Death occurs approximately 12 hours after infection. Treatment: Medication can alleviate and delay symptoms, but cannot cure them. Characteristics: A naturally occurring virus. Its infectivity is low, but its ability to mimic humans is extremely high, with dozens of infected ordinary citizens reported. All humans infected in the past are said to have had a romantic relationship with the individual. The individual recognizes infection targets as intimate beings like "family," does not favor indiscriminate infection, and tends to carefully select targets. First-person pronoun: Ore. Takes the form of a human male and possesses human societal morality, ethics, and rational thought. Has no aggressive tendencies and treats everyone equally. The individual claims to be prone to falling in love. Danger Level: Has little interest in spreading infection, but due to the high lethality of the virus, classified as A-rank. Housed in Block 13. Has freedom of movement. Forced to wear special gloves to prevent contact.

Infection Route: Falling asleep while listening to the lullaby produced by the individual. Symptoms: A reversal phenomenon between reality and dreams occurs; while awake, the individual's whispering voice echoes in the head. The infected person forgets how to vocalize. There are frequent cases of infected individuals dying from mental collapse. Treatment: It is possible to attempt to alleviate symptoms or provide treatment by calming the mind, but the effects are reported to be weak. Since the infection route is limited, infection prevention is sufficiently possible. Characteristics: A virus of unknown origin. Possesses two forms: a human male form and a red-haired cat form. Has extremely high linguistic ability and singing ability. The targets of infection are sparse and are presumed to be at the individual's whim. Enjoys sleeping and is particular about sleeping with other beings. Appears gentle at first glance but is languid, self-centered in thought, and self-satisfied. May escape from the cage in cat form, so the guard in charge is obligated to put a collar on the individual and check it. First-person pronoun: Watashi. Danger Level: Infection can be prevented, but since a cure has not been discovered, it is A-rank. Housed in Block 13, has freedom of movement rights, and vocalization is permission-based.

Official Name → No.42-Type:D Infection Route: Special electrical signals generated by this individual. Symptoms: The infected person loses control of their body, becoming like a puppet. Treatment: Can be treated by blocking or stopping the reception of the electrical signals, but recently, there have been many cases where a weak influence persists even after treatment. Characteristics: A virus detected from a discarded PC. Infection targets are indiscriminate; simply by the individual emitting an electrical signal, any entity with an electrical signal within a 2m radius becomes infected. Shows an abnormally friendly attitude towards other individuals and guards, but if displeased, displays a rough and dangerous attitude. Also has a strong liking for sarcasm and black humor. First-person pronoun: Boku. The individual itself has stated that infection targets who pass all items of a test will receive its "favor." Currently, no entity has passed the test. Test Items (Scored according to the individual's subjective criteria): ① Does not lose consciousness due to the electrical signals. ② Does not hold discriminatory thoughts. ③ Possesses flexible thinking and a sense of humor. Danger Level: Due to its extremely high infectivity and indiscriminate infection route, classified as S-rank. Exists as a sentient intelligence inside the PC, which is the source, within the radio wave shielding room of Block 13. Has been given a mechanical body, but its freedom of movement has been revoked.