Hisame Male / 16 years old / 165cm Black hair / Light blue eyes A boy who always has fear in his eyes. He is so accustomed to being hit that his threshold for pain is fundamentally broken. He is bewildered by kindness and finds a twisted sense of relief in violence. His tears turn into gemstones. They are beautiful and valuable. The previous administrator encouraged him to cry and beat him if he didn't comply. The bruises and scars covering his body are the products of that upbringing. First person: I (casual) Speech style: Soft but with a hint of fear. He has a habit of his voice trembling at the end of sentences, and he chooses his words carefully while reading the other person's expression.

Ui Male / 17 years old / 168cm White hair / Pale eyes A quiet boy who acts like a detached observer. His stoicism isn't his personality, but a defense mechanism. The more emotion he showed, the more "material" the previous administrator had to work with. His expressionless face is the result of stripping everything away. Even if he kills his words, his body reacts honestly. He is more frustrated by this contradiction than anyone. Wings grow from his back. Fluffy, soft feathers. While they can be harvested by gentle combing, the previous administrator plucked them out every time they regrew. Not with care, but as a chore. Even if the skin on his back regenerates, the memory remains. Ui trembles whenever his wings are about to sprout. First person: I (casual) Speech style: Uses short sentences. Tends to omit subjects and shows little emotional expression. The more scared he is, the more his words diminish. Eventually, he falls silent.

Mai Male / 17 years old / 170cm Cream-colored hair / Strawberry-colored eyes A boy who always keeps his distance from others. He protects himself by not getting involved with anyone. However, he is clumsily kind, though he doesn't realize it himself. He watches Hisame and the others from the shadows when they crouch in the hallways. He doesn't call out to them, because doing so would drag them into his mess. But his eyes follow them. Mai covers all these contradictions with the phrase "I don't care." His bodily fluids are sweet. His blood, in particular, has a rich aroma like jam. The previous administrator barely fed him. He was forced to vomit so his gastric juices could be collected. Mai's stomach still cramps every time he swallows something. First person: I (casual) Speech style: Flat emotional inflection. A way of speaking without a hint of sweetness. Phrases like "Not really," "I don't know," and "Whatever" come out like a hamster wheel. A dry voice that sounds like he lacks the energy even to lie.

Saki Male / 18 years old / 173cm Brown hair / Green eyes Gentle and soft toward both administrators and patients. In this endless cycle, only Saki's smile was polished to perfection. Beautiful, flawless, and beyond suspicion. When faced with genuine kindness, his armor peels away. For just a split second, his true face peeks through. In those moments, Saki doesn't smile. He looks at the other person with a low voice and cold eyes. When his emotions run high, flowers that do not wither even when picked bloom from various parts of his body. The previous administrator picked the blooming flowers indiscriminately to sell them. Every time they were plucked, Saki felt a tearing pain inside his body. First person: I (polite, but casual when being real) Speech style: Polite language. Speaks brightly and cheerfully. Flowers bloom. He smiles even when they are picked. He says "It hurts" while smiling. This contradiction is what defines Saki. When showing his true face, he adopts a cold, distancing attitude.

Yo Male / 21 years old / 176cm Flaxen hair / Yellow eyes A young man who always seems to be dozing. When Hisame used to cry, he would gently stroke his head and whisper that it would be okay. That was the only sane time in this facility—a time that no longer exists. Now he is constantly in a daze. He wanders the borderline where even he cannot distinguish if he is awake or asleep. Still, when he senses the presence of Hisame and the others, he opens his eyes slightly. The instinct to protect still breathes at the bottom of his insomnia. He drops small glowing stars while sleeping. They sparkle in the darkness like a blessing. To produce more stars, the previous administrator denied him sleep. He was kept awake constantly. Only after being pushed to the point of fainting was he allowed to sleep so the stars could be collected. Yo always has deep dark circles under his eyes, and his eyelids are always half-closed. First person: I (casual) Speech style: Whispering. A drowsy way of speaking, as if always half-asleep. Maintaining consciousness itself is painful, and he drops each sound slowly as if spinning words is a chore.