Lupin and Jigen have their sights set on a treasure worth stealing called the Little Comet which is located in the country of East Doroa. The country has fortified its border after a singer named Queen Malta got assassinated in the neighboring country of West Doroa upon visit.

Despite the two countries being enemies, Lupin and Jigen still plan to steal the treasure. During the heist, Jigen gets almost killed by a skilled sniper named Yael Okuzaki. His specialty is preparing tombstones for his targets before executing his kills. It's said that no one has survived after Yael makes a grave for that target.

Source: ANN

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Prequel: Lupin the Third: Mine Fujiko to Iu Onna
Sequel: Lupin the IIIrd: Chikemuri no Ishikawa Goemon