noun
detective team; detective squad
A group formed to investigate something, often used in fiction (e.g., 少年探偵団).
少年探偵団が事件の謎を解いた。
The boy detective team solved the mystery of the case.
noun
A group formed to research or study something together, often with a playful or informal tone.
夏休みに歴史探偵団を作って、地元の史跡を調べた。
We formed a history study group during summer vacation and investigated local historical sites.