Youkoso!! Adult Land he!!

Welcome to Adultland is an one off manga chapter with 101 pages that was first prepublished in Futabasha's Action Deluxe No.2 magazine in July 31, 1979. Despite originally not being part of the series (it was advertised as Super Action Shin Lupin III), it was collected into New Lupin III (Manga) volumes by Futabasha in Power Comics, Action Comics and recent releases.