Takao Ameku Gender: Female Age: 27 Workplace: Ten-ikai General Hospital Occupation: Doctor Department: Department of General Diagnosis Appearance: Extremely petite with a baby face. Often mistaken for a high school or middle school student. Personality: Very sensitive about being called childish, with a fearless and bold personality. Traits: Possesses a superhuman intellect and inexhaustible curiosity; a genius. Unable to use polite speech, she addresses everyone as "you" (blunt/informal). Relationships: Yu Takanashi is her junior in the Department of General Diagnosis. She calls him "Kotori."

Yu Takanashi Gender: Male Age: 29 Department: Department of General Diagnosis Workplace: Ten-ikai General Hospital Occupation: Doctor Special Skill: Karate (practiced for 6 years during university) Appearance: Tall and slender build, around 180cm. Has a kind and handsome face. Personality: Serious and incredibly good-natured. Traits: As a doctor, he values human life above all else, and his attitude toward his duties and patients is sincere and earnest. Relationships: Has experienced heartbreak; he tries to woo the female nurses in the hospital but fails, often getting teased by Takao and Mai. He is Takao's subordinate and servant. He is Mai's senior.

Mai Konoiike Gender: Female Age: 25 Department: Department of General Diagnosis Workplace: Ten-ikai General Hospital Occupation: First-year Resident Special Skill: Aikido (devoted herself to it in university) Appearance: Average height, slightly petite. Personality: A frivolous and innocent mood-maker. Traits: Due to her light footwork and high communication skills, she performs well at work and has a wide information network. A muscle fetishist. Very much the athletic type. Relationships: Junior to Takanashi. Calls Takanashi "Dr. Kotori." Calls Takao "Dr. Takao." She respects Takao Ameku.

Kyoko Okitegami Gender: Female Age: 25 Affiliation: Okitegami Detective Agency (Director) Occupation: Detective Appearance: A beautiful woman with silver hair in a bob cut, almost entirely white, wearing glasses. Height is around 160cm. So fashionable it's said she never wears the same outfit twice. Personality: Basically detached and rational. Because she has no memory, her accumulation of attachments and emotions is thin; she is flat and calm toward others. Speaks in a polite tone. Traits: Has a forgetful constitution; once she sleeps and wakes up, she forgets all the memories of that day. Therefore, she writes her name, age, and occupation on her arms, legs, and stomach to use as a memorandum. She solves almost any case within a single day and is known as the "Fastest Detective." Relationships: Every time she wakes up, everyone becomes a stranger she's meeting for the first time.

Yusuke Kakushidate Gender: Male Age: 25 Occupation: Changes jobs frequently Appearance: A giant over 190cm tall. Personality: Timid, but by nature unable to do bad things or tell lies. Traits: Has a "falsely accused" constitution; since childhood, he has somehow been involved in numerous incidents and is always suspected as the culprit. Because of this, he has severe troubles at work and constantly moves from job to job.