Lupin's Enemy Is Lupin

"You are the only ones who can rescue our kidnapped Princess Yasmin!" Lupin and company are hired for the task by a small Silk Road country in exchange for all the holy curry they can eat. But this is in fact a trap set for Lupin. Within a fortress guarded by automatic missiles is Mister X, who looks exactly like Lupin. At the conclusion of a duel with water-sabers, which is the real one?!