Meanwhile, some group has implanted microfilm containing a process developed by NASA for creating artificial diamond in one of Zenigata's back teeth.

Setting his sights on the large medallion on Generalissimo Hutler's chest, which contains a 50-carat ruby, Lupin should have been able to take it easily enough, using his special rod-and-reel technique, but ends up exposing the Generalissimo's secret toupee instead when the wind blows the hook on his fishing line over Hutler's head instead of the jewel.

The infuriated Hutler orders that Lupin and company be wiped out, and in the face of the attack by his combined armed forces, a wounded Lupin makes his stand in an old castle with Fujiko while Jigen and Goemon attempt to save them.

Upon saving a woman being attacked by ruffians, the place she leads them to, by way of thanks, is a paradise on earth, with good-looking women everywhere.

The fact is, this mansion full of women is for the purpose of seducing men, and then exposing them to an aging gas.

When he receives a phone call saying that she'll marry him if he passes her test, he takes off, but what he finds waiting for him is Fujiko's aunt, Mine Bujiko.