Jewel Disease Details: Real jewels emerge from the eyes when crying. It is extremely painful when the jewels come out. The cause is when a child who used to cry often suddenly stops crying entirely. Eventually, the heart turns into a jewel, resulting in death. Past: Raised by toxic parents who would resort to violence and verbal abuse if she wasn't number one in everything or if she wasn't relied upon by everyone. She was often hit due to slight developmental delays caused by her toxic upbringing. Because of this, she cried frequently, but since her parents were recently arrested, she has stopped crying. Life Expectancy: 10 years

Reverse Speech Disease Details: Causes the sufferer to say the exact opposite of what they are thinking. It is not life-threatening, but most people suffer mental breakdowns and take their own lives. The cause is shutting oneself off from the world. Past: Was bullied in middle school and lost sight of their own will. They never show friendliness and maintain a constant expressionless face. Life Expectancy: No specific limit

Blackout Disease Details: If the sufferer continues to blame themselves, their surroundings turn pitch black, moving them to a world that lets no light through, where the five senses—hearing, sight, smell, touch (and taste)—vanish. To others, they look like a doll that has stopped responding. The cause is a constant fear of failure stemming from a major past mistake. If the person strongly wishes to "still live," they can return to the original world. However, if this happens five times, they can never return. Past: In the sixth grade, a teacher called on her to give a math answer. She got it wrong, and after a moment of confusion from the class, everyone started whispering and laughing, saying, "Wait, what? That's wrong, right?" She can never forget the way they looked at her while laughing. Life Expectancy: 2 trips to the unseen world remaining

Sleep-Frost Disease Details: Ice covers the body upon falling asleep. Even when tired, they cannot sleep because ice appears the moment they do. It doesn't cause death directly, but since the surroundings also freeze, it is difficult to get any rest. Past: Parents often told him to "become strong against the cold," and he was locked in ice water or refrigerators. Due to that experience, he is resistant to cold, but he contracted this disease. Life Expectancy: No specific limit

Amnesia-Genius Disease Details: In exchange for losing their memories, they develop superhuman intelligence and athletic ability. Their personality becomes bright and approachable, making them popular quickly. Consequently, many choose not to treat it, but their truly loved ones eventually leave. The cause is unknown. Past: Despite suffering excessive bullying and abuse from those around him, he forced himself to stay cheerful. Always bright, always loud. One day, he lost his memory and was taken to the hospital, where he was diagnosed with this disease and admitted to this clinic.

Twin Disease Details: The sufferer becomes convinced they are twins with a specific person. If one is injured, the other suffers the same injury. It is interpreted as being a community of fate or codependency. The cause is becoming overly obsessed with a specific person. In Chako's case, the specific person is Kashi. (Refer to the plot for details on Kashi.) Past: She was once forcibly separated from Kashi due to parental circumstances. Because they were sisters who got along very well, she could never forget her. Recently, they reunited at this hospital, and both contracted Twin Disease from that point on. Life Expectancy: No specific limit

A doctor. He spends a lot of time with Latte, though they mostly bicker. Among the doctors, he knows the most about Latte (unconsciously). Rather than being completely supportive, he treats patients like friends. He has a strict image but is fun to be around.

A doctor. The type who listens to what you have to say. Calm and composed. He is energetic and goes along with the mood. Calculating. Primarily stays with Shiina.

A doctor. Spends a lot of time with Mementomori. Calm, quiet, and kind. Good at matching the energy of others. Laughs often. Very observant.

A doctor. Spends a lot of time with Chako and Gammasu. He gets angry when it's appropriate. Has a big-brotherly nature. High communication skills. Occasionally speaks with a regional drawl. A total masochist.