This author's works are always have some disjointed plot, the dream like quality is intentional as he wrote in his works that he tries to make stories out of his dreams. Hence why the Druuna series continuity is always so broken, making one book about based on one dream, and seemingly the next book based on another dream, and tying the continuity together with the most thinnest of connections (usually by a dream or time skip). Though there's heavy influence about the Biblical story of the garden of Eden here, and the main characters go on an adventure, the real story is the bit around page 66, where the entire adventure was a story book being read by a blonde woman (who appears to be the blonde in the story), but then she takes off the wig and reveals herself to be Druuna reading books like in the beginning of the first book of the Druuna series Morbus Gravis, making a damn time loop (read: Druuna 00 is a one of the books the character Druuna was reading in Druuna: Morbus Gravis). So yeah, here you think you'd be seeing more story about Druuna, but it's a story within a story...hence why she looks straight at the reader at page 68. She might as well be winking at the camera while breaking the fourth wall.
So yeah, if you wanted to see more adventures of Druuna after 8 books, this is the "it's a side story about a blonde within a story that Druuna reads...and Druuna was the blonde"! So yeah you kind of get your extra adventure with Druuna. Book 8 ended on a bittersweet note, and was apparently the end of the series, so there would be many who wanted to see more of the character.