After pulling off a daring casino heist, Arsene Lupin III learns that the loot he nabbed is no ordinary cash but the infamous 'Gothic Bills,' nearly flawless counterfeits. Eager to unravel this mystery, Lupin teams up with his comrade Daisuke Jigen on a journey to the secluded realm of Cagliostro. Their mission takes an unexpected turn when they rescue a damsel in distress during a heart-pounding pursuit, only to discover she is Clarisse d' Cagliostro, the heiress to the late Duke's fortune. Facing a treacherous scheme orchestrated by Count Cagliostro to seize Clarisse's inheritance, Lupin, known for his charm and wit, jumps into action. With the enigmatic Goemon Ishikawa XIII, the seductive Fujiko Mine, and the relentless Inspector Zenigata adding to the mix, tensions rise as they all converge at the historic Cagliostro Castle. Amidst the grandeur of the castle, Lupin's past collides with the present as long-buried secrets begin to resurface, painting a picture of deception and intrigue.