Ep. 5: Lupin finds himself in 1930s Japan as the thief Golden Mask pursued by Namikoshi and Akechi.

Lupin wakes up in Showa era Japan around 1930, discovering he is the thief Golden Mask being chased by Inspector Namikoshi, who resembles Zenigata. He targets a national treasure from the Imperial Museum but faces opposition from detective Kogoro Akechi and the Black Lizard, who looks like Fujiko. The Black Lizard works for Colonel Daidoji, aided by a Major resembling Jigen wielding a Model 14 Nambu Pistol. Meanwhile, Ruriko Shigetomi, heiress of the Shigetomi department store, transports a centuries-old automaton clock from Inner Mongolia to Tokyo with the help of Sarantuya, whose family guarded the item for generations. Lupin fails to steal the clock on the train, and it is displayed at the department store. While investigating his Golden Mask identity, Lupin breaks into the store and meets Ruriko, but they are interrupted by a sword slash from Goemon Ishikawa.

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