The special's story centers on the kidnapping of Rebecca Rossellini, a beautiful business owner who is a featured character in the new Lupin III TV anime series that is currently airing. Upon hearing of her kidnapping, Lupin rushes to her rescue. Additionally, Lupin receives a written challenge from a mysterious person named "The Masked Count" suggesting a contest: who can obtain the "inheritance of Count Cagliostro" first.

(Source: Anime News Network)