After a chaotic heist, Lupin and Jigen find themselves becoming caretakers of a baby boy, while a young sky pirate called Yutika is after their loot. Yutika is an inhabitant of the city-state of Shahalta, which has recently fallen to a shady minister. Soon, Lupin's gang and Yutika join forces to uncover one of Shahalta's greatest treasures, facing off against both Shahaltan authorities and Zenigata.

This is the fourth movie starring a tiger boy named Shimajiro.

Lupin & Jigen have their sights set on a treasure called the Little Comet, which is located in the heavily fortified country of East Doroa. During the heist, Jigen is almost killed by a sniper named Yael Okuzaki. His specialty is preparing tombstones for his targets before executing them. It's said that no one can survive after Yael makes their tombstone.