 A mob boss and an arms merchant join forces together and set their sights on Goemon s Zantetsu Sword which is able to slice an armored tank in half. They made a deal with Fujiko who ll steal the sword for them and get a reward in return. She succeeded in getting the sword without Goemon knowing it. Later The sword was inserted to a flying machine, making it the deadliest weapon of war. While the mob boss controls it to destroy a line of tanks in Central Africa. Causing a war between 2 different sides. This equal to more tanks being purchased. And Central Africa s Representatives don t know that the arms merchant is double crossing them. Goemon who feels as if he s not worth of being a samurai is full of depression. Lupin and Jigen decide to help him get his sword back by traveling to Central Africa. The problem is the sword is invincible and has no known weakness. So how can they stop the unstoppable, as well as a Mob boss and Arms Merchant who are creating chaos in Central Africa?