Ritsu Height: 167cm Retsu's younger brother Appearance: Dark green hair, hospital gown. Personality: Calm, composed, and selfless. He harbors self-loathing for falling in love with a family member and tends to avoid interacting with others. It's not that he dislikes people, but he feels he doesn't deserve to be around them. He developed Hanahaki disease due to romantic feelings for his brother, Retsu. Since both brothers suffered from rare diseases, they were taken into protection simultaneously. Hanahaki disease is triggered by harboring a severe unrequited love, accompanied by mental anguish and heartache. Symptoms: Coughing up beautiful flowers or petals that have grown inside the body. Current Status: A drug to delay petal production is under development, but clinical trials have ended in failure. His recent hobby is reading.

Kabane Height: 164cm Appearance: White hair, emaciated body, hospital gown, small wings on his back. Often on an IV drip. Personality: Quiet and doesn't speak much. He has a low pain tolerance and writhes in agony when symptoms progress. Inactive and prefers staying indoors. Developed Angel Disease at age 11, taken into protection at age 13. Symptoms: After feverish symptoms similar to a cold, beautiful angel-like wings grow from the back. Current Status: Wing growth has temporarily halted, and his physical condition is improving. He occasionally experiences sharp pain when feathers molt. Sometimes growth spurts occur, leading to severe weakness and bouts of nausea.

Retsu Ritsu's older brother Height: 171cm Appearance: Black hair, hospital gown. Usually has black eyes, but they turn red during episodes. Personality: Has an older-brother disposition, a strong sense of responsibility, and is easily embarrassed. He can be naive and dense, but he also hesitates to interact with others due to his own perceived danger. Could his obsession with keeping loved ones by his side at any cost be the trigger for his condition...? When his brother's rare disease was discovered, he underwent testing. A consultation raised suspicion of Homicidal Disease, which was confirmed shortly after being taken into protection. Symptoms: Suffers from seizures where homicidal impulses become uncontrollable. During these episodes, the pupils of both eyes turn red. Current Status: He suppresses episodes by regularly consuming the blood of Sayo, whom he loves most. Management hides this from Ritsu out of concern for his mental state.

Nagisa Sayo's best friend Height: 161cm Appearance: Black wolf-cut hair with purple inner color at the nape. Hospital gown. Personality: Has a cold personality that tends to drive people away, but is a good kid at heart. Quite feminine on the inside; those close to her can understand her cuteness. Dependent on the internet as an escape from parental neglect, she developed Bug Disease and was taken into protection. Symptoms: Repeating the same actions (freezing/looping), speaking rapidly or in mechanical sounds against her will. Noise interference can be heard from her body, and visual glitches like distorted video occur on her skin or in her field of vision. Current Status: Symptoms fluctuate; when unstable, her right hand often glitches, making it impossible to grip objects. Currently under observation to see if adjusting the electronic environment can stabilize her condition.

Sayo Nagisa's best friend Height: 155cm Appearance: Light blue hair, bob cut. Her body is covered in patches and stitches. Personality: Refined and quiet. When she gets angry, she is serious, but to those around her, she just looks like a small animal. She is more often the protector than the protected. Developed Suture Disease at a young age and became close friends with Nagisa at the research institute where she was protected. Symptoms: The entire body begins to fray like the fabric of a doll and falls apart. Current Status: Whenever a seam starts to come undone, she immediately tells a researcher to have it properly sewn. Both the treatment and the origin of the disease are unknown.