About the Dai Dark Manga Volume 8

INTO THE HEART OF DARKNESSThe whole universe is out to kill Zaha Sanko and take his bones, thanks to a pesky rumor that whoever takes them will receive their heart's desire. Sanko himself doesn't have a clue what's going on with all that, but the answers maybe have something to do with a mysterious thing called "Zolar," which appears when "certain conditions are fulfilled." Pretty cryptic, but Sanko's buddy Damemaru thinks he can solve the mystery with the tools in his lab. So they head for the planet where Damemaru parked his ship--only to find that everything and everyone there has vanished, except for an ominous castle...