The Swindler, the Vanishing Man, and the Pretty Boys (1)

The Pretty Boy Detective Club obtains an invitation to a mysterious casino called Reasonable Doubt. When they arrive at the casino, they find that all the patrons and employees appear to be middle school kids. The manager of the casino, Lai Fudatsuki, challenges Nagahiro Sakiguchi to a showdown, and if Nagahiro wins, he acquires the right to operate the casino!