The Patranger are on the case after a young boy tries to fight the bad guys, reminding Keiichirou of himself as a boy, and receive a new collection piece in the process. The Lupinranger discover that their are two Ganglar, but find that between the two of them, they only have one collection piece.

The Patranger fight a revived monster whose remains were previously held in HQ; Kogure tells the Lupinranger the story of Arsène Lupin and Good Striker.