In modern London, England, a young man named Victor Kordaus, who wanted to be a detective, accidentally traveled to London in 1920 when he was looking for a book called "The Boy of Truth" in the basement library of his home. Here he met his "great-grandfather", Duke Kordaus, and learned about the existence of the 12 relics of truth and the Door of Truth. In order to return to modern times, Victor made a group of like-minded friends in this era and formed the Truth Detective Agency. However, Edwin, who represents "knowledge" in the detective agency, was bewitched by the mysterious cat-eyed thief, and the detective agency encountered a rebellion. Just when Victor was in trouble, a mysterious noble boy and descendant of the Gods appeared to guide them in their search for the holy object of truth.
Purpose: Seek your own truth on the road of investigating and become the next Sherlock Holmes.