A phantom thief named Rusty Nail sends a letter to a mansion, saying they're going to steal their treasure. The Mikuni Detective Agency is called to protect the treasure, but are they up to this challenge?

The detectives are put in charge of doing a hero show in one of Mikuni's buildings. Of course, things don't go well.

Takumi and the others are at a celebrity party as bodyguards... when Rusty Nail appears. Will Takumi and the others be able to save the celebs from Rusty?