The Detective Boys mostly deal with murder and theft cases as evidence whenever the group stumbles into a case, goes on a trip with Professor Hiroshi Agasa or when they tag along with Kogoro Mouri. Three adults also joined this group informally, namely Professor Hiroshi Agasa, who provides the group with special gadgets to aid them in their adventures, their Homeroom Teacher Sumiko Kobayashi, a mystery novel enthusiast who proclaimed herself their manager and their Assistant Homeroom Teacher Rumi Wakasa, a mysterious individual who is very skilled in martial arts and has very sharp deduction skills. Some time later, their new classmate and former Black Organization Member Ai Haibara was drafted into the group. After advertising their services in school, they have become actively involved in many criminal cases provided by their schoolmates, though more often than not they keep accidentally coming upon such during their free-time activities. Particularly, after the case involving a sizable cache of stolen Italian gold coins, Ayumi, Genta and Mitsuhiko developed a taste for detective work and impulsively decided to become investigators themselves. In time, the four kept stumbling into more and more criminal cases which were resolved thanks to Conan's Deductive Skills and Initiative. After Conan succeeded in exposing the two, they were arrested and the case was resolved. In the course of this adventure, Conan found out that the house was still inhabited by the mother and son of the murder victim the son had killed his father in a fit of rage over his abusive behavior, and his mother had subsequently locked her own son in a dungeon beneath the house to wait until the deed's time-bar had passed. Conan Edogawa and his classmate Mitsuhiko Tsuburaya were drafted into accompanying the two and the four of them eventually entered the house.

The Detective Boys were informally founded when Ayumi Yoshida and Genta Kojima decided to investigate a mansion which was once a murder site and had been abandoned.

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