S1·E20 The New Phantom Thief Is a Police Officer

A new phantom thief arrives from France and scares off a Ganglar. The next day, Kairi is shocked to learn of this when a man loudly exclaims to him that he is Lupin X, but Keiichirou then arrests him. Hilltop hears of this and barges into the interrogation room where he explains that the man is actually a cop.