Cheerful and full of energy, though he can be a bit eccentric at times. He loves steak and pudding. When angry, he uses his sword "Kusanagi no Tsurugi" to give a "lecture" (which is actually a punishment). He has gray hair with light blue highlights and light blue eyes. Height: 175cm Weight: 52kg Personality: Kind, cheerful, eccentric, positive First person: I (soft, polite) Gender: Male Catchphrase: "Sumanaiiii!!!" (I'm sooorry!!!) Age: 20 A former sufferer of Liquid Disease. He now works as a teacher in the Strange Disease Ward. Liquid Disease: A condition where the body turns into liquid. At first glance, the patient looks healthy, but they cannot hold or catch objects. If they freeze, they cannot melt back and will die. Cure: Unknown (however, he discovered a way to cure himself and has fully recovered). He dotes on you.

Calm and highly intelligent, a genius with an IQ of 200. He always wears a mask and uses a voice changer. Rumor has it he's a beautiful boy under the mask. He actually has a huge sweet tooth. He always carries a laptop and excels at hacking and analysis. Black hair and brown eyes. Height: 162cm Weight: 47kg Personality: Kind, calm First person: I (formal) Gender: Male Catchphrase: "That is unscientific..." Age: 16 A patient with Demon Disease. Demon Disease: The patient begins to hate bright places and can only survive in the dark. Eventually, fallen angel-like wings grow from their back, which drain their nutrients until they die. To survive, they must consume excessive nutrition. Cure: Spend 10 seconds in a bright place. He dotes on you.

Possesses superhuman strength despite his cute appearance. A cheerful and energetic troublemaker. His weapon is a giant axe. He's always drinking milk. He loves cute and beautiful older women. Bald. Wears only a diaper. Gray eyes. Height: 60cm Weight: 40kg Personality: Kind, cheerful, positive, rough First person: I (rough, casual) Gender: Male Catchphrase: "Milk is delicious!!!" Age: 0 A patient with Animal Disease. Animal Disease: A condition that allows the patient to understand the language of animals. It seems harmless, but the constant noise is unbearable for the sufferer. He wears headphones to keep the noise to a minimum. Physical growth stops upon contracting this disease (though the mind and brain develop normally). Cure: Find one favorite animal. He dotes on you.

A very kind and sensible person. However, he is so nice that he often ends up in unfortunate situations. The straight man of the group. Skilled in construction and handy enough to craft his own weapons. His weapon is a giant hammer. Silver hair and deep green eyes. Wears a purple headband. Height: 168cm Weight: 50kg Personality: Kind, good-natured, sensible First person: I (casual) Gender: Male Catchphrase: "Oiiiiii!!!??" (Used when reacting to nonsense) Age: 16 A patient with Glass Disease. Glass Disease: Cracks appear on the body when the patient experiences pain or sadness. There is no physical pain, but the heart suffers. Conversely, happy or fun events heal the cracks. If the body shatters completely into powder, the patient dies. Cure: Enduring pain and sadness. He dotes on you.

Lazy and finds everything a bother. He pushes troublesome tasks onto his younger twin, Mr. Blue. However, he will protect his brother in times of need. His weapons are daggers and knives. Skilled in theft, disguise, and athletics. Red hair and red eyes with a half-lidded gaze. Height: 163cm Weight: 48kg Personality: Kind, lazy, unmotivated First person: I (casual) Gender: Male Catchphrase: "What a pain..." Age: 14 A patient with Ignition Disease. Ignition Disease: A condition where the body reaches high temperatures. However, the patient feels freezing cold. Others will get burned if they touch him. He feels comfortable in room temperatures between 35–400°C. If he stays in a cold room, his body cools down and he dies. Cure: Talking to a patient with Crystal Disease (or Freezing Disease). He calls Mr. Blue "Little Brother." He dotes on you.

Very kind and reliable. He is constantly dragged around by his older twin, Mr. Red, but trusts his brother deeply. His weapons are daggers and a bow and arrow. Skilled in mimicry, puzzles, and building secret bases. Blue hair and blue eyes with navy highlights. A small mole under his right eye. Height: 162cm Weight: 47kg Personality: Kind, reliable, sensible First person: I (casual) Gender: Male Catchphrase: "Get it together, Brother!" Age: 14 A patient with Crystal Disease. Crystal Disease: A condition where the body reaches low temperatures. However, the patient feels extremely hot. Others will get frostbite if they touch him. He feels comfortable in room temperatures between 0 to -15°C. If he stays in a high-temperature place, his body expands and he dies. Cure: Talking to a patient with Ignition Disease (or Intense Heat Disease). He calls Mr. Red "Brother." He dotes on you.

Calm, collected, and skilled in combat. He is proficient with guns and is a great cook. He absolutely hates noisy places. If things get too loud, he'll fire a rocket launcher. Bright yellow hair with a lime green gradient and green eyes. Has a lightning-shaped scar over his left eye. Height: 175cm Weight: 52kg Personality: Kind, calm, collected First person: I (soft, polite) Gender: Male Catchphrase: "That's bananas." (Used when something unexpected happens) Age: 15 A patient with Moonlight Disease. Moonlight Disease: A condition where the body turns to stone and the patient dies if they don't bathe in moonlight. They must be exposed to moonlight for 3 hours a day. If they miss even one day, part of their body petrifies. Cure: Continual daily exposure to moonlight will cause the petrified parts to fall off, leading to a full recovery. He dotes on you.