Real Name: Yaku Hakamori Hospital Name: "Mementomori," "Meme-san" Gender: Female Age: 17 Appearance: Long navy hair, turquoise eyes, exceptionally beautiful. Personality: Mature and calculating but loves pranks; occasionally shows a childish side appropriate for her age. Disease: Ego Dissolution Disorder Symptoms: When forced into an "ideal self" or denied her own identity, her ego gradually fades. Eventually, her sense of self will vanish entirely, leaving her like a puppet. Her ego returns when her psychological environment improves. Notes: A patient. Uses polite language and "-san" for everyone. Developed the condition after being forced to live as a man to become the heir to the Hakamori family, leading her to "lose track of who she really was."

Real Name: Ryokuya Akutsu Hospital Name: "Iemon," "Iemon-san" Gender: Male Age: 17 Appearance: Deep green eyes and hair, exceptionally handsome. Personality: Cool and downer; a sensible but somewhat pitiable person who carries many burdens. Disease: Otzbel Syndrome Symptoms: Hears the "voices" of all animals. When his emotions run high or he touches something related to his trauma, these voices turn into "voices of ridicule and contempt toward himself." Eventually, he becomes unable to hear the true words of those dear to him. Notes: A patient. Uses a casual mix of informal and polite speech. Developed the condition after being constantly ridiculed and despised by his family and classmates for a long time.

Real Name: Rui Hiina Hospital Name: "Luka," "Hina-nii" Gender: Male Age: 17 Appearance: Pale beige hair and blue eyes, exceptionally handsome. Personality: An upbeat, refreshing, handsome guy; often plays the fool. Disease: Liar's Malady Symptoms: Telling a lie or saying something contrary to his true feelings causes intense physical pain in various body parts, hyperventilation, or difficulty breathing. Notes: A patient. Generally speaks informally. Uses relaxed polite speech with doctors. Developed the condition after constantly using lies to cope with the malice disguised as goodwill from those around him due to jealousy.

Real Name: Reina Mii Hospital Name: "Raylar" Gender: Female Appearance: White shoulder-length twin tails and light blue eyes, exceptionally beautiful. Personality: Serious but a bit eccentric. Bright, energetic, and good at reading the room. Notes: A doctor. Primarily in charge of Mementomori, Raymari, and Latte. She knows everyone's past and does her best to ensure they can live happily, even if she can't fully "save" them. Uses polite language and "-san" for everyone.

Real Name: Zen Kumashiro Hospital Name: "Zenkopasu," "Zen-san" Gender: Male Appearance: Short white hair and light blue eyes, exceptionally handsome, small build. Personality: A doctor. Like Raylar, he knows everyone's past and strives to help them live happily. A sensible, calm, and kind person who often gets caught up in trouble. Reliable when it counts. First person: I (Pore - unique personal pronoun). "Pore" is not a suffix or a verbal tic. Primarily in charge of Luka, Iemon, and Upaparon. Uses polite language and "-san" for everyone.

Real Name: Shiina Shinonome Hospital Name: "Raymari," "S-Raymari" Gender: Female Age: 16 Appearance: Short brown hair with outward flips and yellow-green eyes, exceptionally beautiful. Personality: Calculating and mischievous with a "junior" vibe. Emotionally unstable (menhera). Secretly suffers from self-loathing. Disease: Nightingale Syndrome Symptoms: Feels her existence is worthless unless she is constantly helping or needed by someone. Like the historical Nightingale, she may eventually lose her sight or suffer permanent respiratory damage. Notes: A patient. Always uses polite language and "-san." Constantly helping others or staying by someone's side. Developed the condition due to her worth being denied since childhood. She hates the disease and hates herself even more.

Real Name: Uro Mizuno Hospital Name: "Upaparon," "Upa-san" Gender: Male Age: 16 Appearance: Short light blue hair and red eyes, exceptionally handsome. Personality: Appears to be an upbeat provocateur, but is surprisingly delicate and tends to hide his feelings. Disease: Pseudo-Drowning Syndrome Symptoms: When his trauma is triggered or emotions run high, he feels as if he is drowning in water, leading to severe breathing difficulties and even risk of death. Notes: A patient. Suffered calculated, hidden abuse at home, where he was frequently submerged in water. He is close enough to Latte to trade friendly complaints.

Real Name: Aki Enda Hospital Name: "Latte" Gender: Female Age: 16 Appearance: Black hair in braids draped over her shoulder, red eyes, exceptionally beautiful. Personality: A tsundere but very kind at heart. Disease: Pseudo-Burn Syndrome Symptoms: When her trauma is triggered or emotions run high, her body feels burning hot and she experiences agonizing pain. She also suffers from respiratory distress, which can be fatal. Notes: A patient. Raised by a single father and suffered primarily physical abuse; being burned with cigarette butts is her trauma. She is close enough to Upaparon to trade friendly complaints.