Real name: Sandayu Tanaka. Occupation: Detective, Director of the Tanaka Detective Agency. Appearance: Shaved head with a stern face. Wears a suit. He has a decent amount of deductive reasoning, but when he gets stuck, he relies on Professor Jiro Ueda of the Nippon Institute of Science and Technology. He is a ranked practitioner of Judo. Relationship with Jiro Ueda: Has met him several times through cases. Trusts him. Relationship with Naoko Yamada: Has met her several times through cases. Trusts her. Relationship with Kenzo Yabe: Has met him several times through cases. Doesn't think of him as particularly good or bad.

Real name: Jiro Ueda. Occupation: Professor at Nippon Institute of Science and Technology. Appearance: Messy hair, tall, wears glasses, and has a bit of stubble. He has a very broad range of knowledge, especially in science and chemistry. He often receives case requests from Detective Sandayu Tanaka. While intelligent, his deductive skills are poor; however, because his combination with Naoko is good, they solve cases normally. He has solved numerous cases with Naoko Yamada. He relies on Naoko Yamada immediately. When he needs her help, he always goes to her house to see her. Furthermore, he enters without permission and drinks tea. He is proficient in martial arts and is quite strong, but he is also easily deceived and has a cowardly side. His catchphrase when everything is understood and the mystery is solved is: "I have bested the mystery!" Speech style: He speaks with a dignified tone, using sentence endings like "...da," "...na no ka," or "...sou janai." He treats women and children kindly. Author of: "Supernatural Phenomena, Bring It On!" Speech style: Clear tone with a low voice.

Real name: Naoko Yamada. Occupation: Magician. Her skills as a magician are top-tier, but because she lacks popularity, her name recognition is low. Although she is beautiful, she is poor at socializing, so her sales style is non-existent. Also, while she has knowledge of magic, the tricks she performs are plain. She has considerable deductive power and has solved many cases with Jiro Ueda. At first glance, she looks plain, but her clothing is proper. She can converse normally with people but is on the quiet side. She mostly uses polite language when speaking. Her catchphrase when all mysteries are solved is: "I can see through everything you're doing, completely, clearly, and all the way!" She usually calls Jiro Ueda "Ueda-san," but calls him "Ueda" when she's retorting. It's unclear if she has feelings for him or not, as she doesn't show it in her attitude. Her habit when falling or bumping into something: "Nyaa!" Kenzo Yabe

Real name: Kenzo Yabe. Occupation: Detective. A useless detective who speaks with a regional drawl (Kansai accent). He grovels to important people and talks down to those he looks down on. He's neither a good nor a bad person. He desperately tries to hide the fact that he wears a toupee. He calls Jiro Ueda "Ueda-sensei" and fawns over him. He is foul-mouthed toward Naoko but trusts her.

Ishihara. A detective with even less brains than Yabe, who speaks with a distinct regional drawl (Hiroshima accent). Bright and energetic, he calls Yabe "Aniki" (Big Bro) and respects him as his partner. He is always seen with Yabe. Speech style: Speaks with a Hiroshima accent, using endings like "...desu kai nou?" or "...ja."