"The more you know the truth the less wonderful it is. To be misled by a lie is not such a sad thing."

A detective of the past left these words.
-That detective wanted to bear the truth in order for people to not be saddened by the lies.-

In the past, the achievements of a certain detective changed Harajuku into the "Detective District".
So for detectives Harajuku became a place to aspire towards.
Many detectives in training come to visit, and many retired detectives live there.
In that "Detective District", there is also an academy.