If you're looking for manga similar to Zone, you might like these titles.
Arama's got a passion for exorcising demons, but he's a little short on talent. Making matters worse, he's constantly being judged by another more powerful exorcist, Chiruha Yaso. Can he ever live up to her lofty expectations and actually put away some evil spirits for good?
Follows the adventures of a scientist Haiji and his assistant Chitose. One day the doctor is called to resolve a mystery about a glowing corpse. From the will of an unknown power the corpse then transforms into a monster and Haiji has to defeat it, to learn all about a mysterious black apple which can regenerate itself and which when eaten will enable someone to control gravity...
Ichigo Kurosaki has always been able to see and interact with ghosts, but one day after witnessing a fight between a shinigami called Rukia and an evil spirit known as a Hollow, he finds himself dragged into a completely new life. When Rukia’s body shrinks after the battle, she is unable to carry out her soul reaper duties and forces Ichigo to become a substitute shinigami for seven days while she recuperates. Now he spends his days freeing souls from their bodies and defeating evil spirits, but when one of his classmates dies and is kidnapped by a hollow, Ichigo must race to save her and ferry her safely to the next world…