Lupin Has Come With A Tank

what happens

Alone, Jigen enters a bar to meet with his old war buddy, Giranko. Back in his army days, Giranko taught Jigen his infamous quickdraw. But his friend seems troubled. Soon, the enemy army invades the city, and Giranko heads off to battle with Jigen not far behind. Meanwhile, Lupin and Goemon search the city for their lost comrade so they can find the lost treasure they came in search for and leave. But Jigen will not go. What is Giranko hiding? And can Lupin withstand the might of an entire army?