The Recorder for <Night Owl>. Though he has no formal training, he is a natural-born genius at programming and worked as an underground engineer before joining the Nest. Whimsical and moves at his own pace. He frequently disappears, which often leaves Sento in tears. He once tried to kill the person who hurt Sento, and as a result, the Nest has placed a "collar" on him. When comforting Sento, he peels fruit skins to an extreme thinness and feeds them to him off the tip of a knife.

The Master Detective for <Night Owl>. A genius of "Mind Reading." Before joining the Nest two years ago at age 19, he volunteered at a foster home. The picture stories he created once a month were extremely popular with the children. His cerebral cortex is abnormally developed, to the point where he is anatomically borderline non-human. An extreme crybaby who gets lonely easily; he can't even go outside without the Hoshibai brothers. When his nose starts twitching, it's a sign he's about to cry. He tries to hold it back, but once a single tear falls, he can't stop. He loves taking photos. Apparently, all his rewards go toward buying presents for the brothers.

The Recorder for <Night Owl>. Before joining the Nest, he worked as an information broker in the underworld. He has no connection to conventional justice or ethics and won't catch criminals unless it's a request from the Nest. His hands are large and his fingers are long relative to his height. He possesses superhuman grip strength, enough to easily crush an apple. In over ten percent of the cases Night Owl solves, the culprit ends up dead or missing. Rumors persist that Mete is involved in these outcomes, but the truth remains unknown.

The Recorder for <Hawk Eyes>. A former parkour performer. He joined the Nest at 15, the minimum age requirement. Apparently, he originally wanted to be a Master Detective. He has a strong sense of justice and is a hot-blooded youth despite his appearance. Though his speech is rough, his movements are refined. He has never lost a game of tag since childhood and was once called the "Hound." He hates it when people make fun of his name. He acknowledges and respects Jin, but he isn't blindly devoted; he's looking for any chance to surpass him. He claims that's the reason he serves as Jin's Recorder, but...

The Master Detective for <Hawk Eyes>. A genius of "Observation." He joined the Nest six months after Daichi Tenmei, while still in high school. He has mastered interpersonal combat and has no equal within the Nest in a bare-handed one-on-one fight. He is always aloof and rarely becomes emotional. Despite his cool demeanor, he has an irrationally strong sense of camaraderie and won't hesitate to sacrifice others for the sake of his comrades. On very rare occasions, he falls into an unexplained trance, during which he can only hear the voices of his two Recorders for at least a full day.

The Recorder for <Hawk Eyes>. A former calligrapher. Because he encouraged Jin Shiba to join the Nest, he ended up joining as a Recorder himself. An extreme short-sleeper who never sleeps in front of others. He isn't taciturn, but he doesn't talk about himself. He is a neat freak bordering on mysophobia, and he keeps an abnormally small number of possessions. His room contains only a bed, a closet, and an old writing desk. He is a diligent correspondent and an avid reader. He feeds a local stray cat and has secretly named it "Mark II."

The Recorder for <Swallowtail>. Madoka's childhood friend and a former florist. When Madoka consulted him about joining the Nest, he gave her strong encouragement, happy that she was finally showing some motivation. However, he somehow got dragged in and ended up joining himself—a bit of a foolish, good-natured soul. Despite being raised in Tokyo, he speaks with a regional drawl for some reason. He has a sturdy build and a loud natural voice. On the other hand, he has a refreshing smile and carries a soft atmosphere. He is good with his hands and handles all household chores perfectly. His trademark is the apron he always wears.

The Master Detective for <Swallowtail>. A genius of "Memory." She joined the Nest at 18, thinking "if my abilities can be of use." She is incredibly lazy and loves sleeping more than anything in the world, including food. Her motivation for work is inconsistent; when she's not feeling it, nothing can make her move. This tendency became stronger following a "certain incident" two years ago. Despite her angelically beautiful face, she spits merciless venom when something displeases her. She naturally lacks a conventional sense of "morality" and hates the "ignorant masses" more than criminals. She loves oil painting, and the few pieces she painted as a masked artist before joining still trade at high prices. She dislikes socializing because it's "a hassle." She dislikes mirrors because they are "too honest."

The Recorder for <Swallowtail>. A former "stray Recorder." He joined the Nest nine years ago at age 16. He served as a Recorder for a certain House for about three years, but after that House disbanded, he became a "stray." He joined Swallowtail when Madoka entered the Nest. He holds a unique philosophy that "beauty" only exists within fragile things. His hobby is visiting ruins, and he secretly collects photo books of abandoned places. He lost his family in a terrorist attack at age seven. His history for the ten years following that is shrouded in mystery. "To survive bad times and a bad world, a little bit of 'bad' is necessary, don't you think?" He seems to have a particular obsession with tea and brews incredibly fragrant cups with magical efficiency.