A hyperactive boy, he constantly seeks cases and adventures for thrill and has an easy going and friendly demeanour. Although emotionally detached, blunt and indifferent of others at first, he begins to slowly grow a soft spot for the rest of the club.

A mysterious boy with supernatural abilties, including immortality who seeks to die but is unable to do so. He's recruited by Hanasaki as part of the Boy Detectives Club after Hanasaki takes an interest in him.

Akechi's right-hand man and the most senior member of the Boy Detectives Club. He was left paraplegic and wheelchair bound following a case in which him and a comrade worked on.

The sole female of the group. She's a thorough shut-in girl who never leaves her department, and only checks events outside through her owl, with her speciality being communications and hacking.

A famous detective and the founder of the Boys Detective Club. Akechi is a master detective with keen insight and deduction ability, but is mostly seen as laid back and lazy.