Ryoutaro and the DenLiner gang have set up a detective agency called the DenLiner Police who seek to catch the Imagin that stole a spare Den-O pass from Owner and find the Imagin who has built a crime syndicate with human criminals.

The Owner of Denliner has established a detective agency called Denliner Police to catch an Imagin that stole a spare Den-O pass from him. Ryotaro and the company find that the Imagin has built a crime syndicate with human criminals. Detective Suzuki joins them, and they investigate the syndicate together.