Ep. 19: Lupin faces a keyless safe challenge from the bankrupt Marukin Safe Company's son.
Aired on February 13, 1978

The Marukin Safe Company goes bankrupt after Lupin defeats their supposedly impenetrable vaults. To prove his abilities, the company owner's son issues a challenge to Lupin, demanding he open a unique safe he designed. This specific safe lacks a keyhole, dial, or door. Marukin's son employs extreme tactics to force a hesitant Lupin to accept the task. The narrative questions whether this unconventional lock represents the first safe that the legendary thief cannot crack, highlighting the desperate measures taken to restore the family's reputation.
Episodes
- Ep. 15 · Lupin faces a gem theft challenge aboard the Hendenburg airship
- Ep. 16 · Lupin battles Transformation Sickness that turns him into a cruel criminal at midnight
- Ep. 17 · Lupin III confronts human bomb threats in a blackmail scheme targeting an Arab nation's oil fields.
- Ep. 18 · Lupin hides the Black Panther emerald in a museum while rival inspectors investigate its disappearance.
- Ep. 19 · Lupin faces a keyless safe challenge from the bankrupt Marukin Safe Company's son.
- Ep. 20 · Lupin steals General Hatler's toupee while attempting to take his ruby medallion.
- Ep. 21 · Goemon Returns to Japan to Find His Master Dying and a Stolen Scroll
- Ep. 22 · Lupin and Jigen encounter a deceptive trap involving aging gas at a manor filled with women.
- Ep. 23 · A mysterious woman demands Lupin find Marshal Rommel's lost gold or face death.