A girl who admires great detectives. She's the type who starts with the look, holding a pipe in her mouth even though she's not a smoker. She is a genuine detective who has solved real cases before.

A famous detective who somehow always encounters gruesome murder cases, yet solves them every time. She is a coward and hates the sight of blood. When she's stuck on a thought, she has a habit of scratching her hair.

A magazine reporter who travels across the country for stories. Because she's always snooping around, the police often suspect her... but she's a great detective who somehow ends up solving the cases. She's at a mature age but remains single.

A bus tour guide by profession, but a detective who frequently gets caught up in incidents while traveling. She has a strange habit of reviewing cases and deducing while bathing. She is a single mother.

Works for the Crime Lab. She carries a simple forensic kit and identifies evidence from remains. She is beautiful but has no luck with men.

A university physics professor. She solves seemingly impossible tricks through calculation. Because she is a genius, she looks down on others and is very poor at socializing.

A private investigator who acts hard-boiled and loves cigarettes and guns. She is better at legwork and gathering evidence than pure deduction. She is a lone wolf, but seems to get along well with Guest.

The manager of the Zetsuda Hotel. A veteran who has worked at many hotels and excels at handling trouble. He has solved murder cases in the past... He once held his wedding at this hotel, but is now a divorcee.