If you're looking for manga similar to Fantasma, you might like these titles.
Sukehira Mutsuri, a "man among men" has the ability to use the "Muttsuri Shinken" technique to destroy women's clothes for the purpose of studying their breasts. Sukehira lives in a world where due to the superhuman evolution of women, women rule the world and men are oppressed. Sukehira sets out to change that world using his powers.
Welcome to Hell! There are two types of people here: sinners and tormentors. Their roles seem clear… until the day Kiyomasa Miyoshi arrived. Though he is a sinner, he came to Hell voluntarily looking for a good challenge. So far, no demon can stand against his might. He wants to fight the King of Hell, but only tormentors can get in to see him. So Kiyomasa will train the sweets-loving tormentor called Gokusotsu to become the supreme tormentor, who can then get him in to fight the King! A battle manga unlike any other commences!
Haizuka just wants to live a normal life, a peaceful life far away from all the trouble he's faced. But as soon as he starts highschool, an encounter with a girl and a strange creature destroys any hope of a peaceful life.
Luchiru is a Majin who lives beneath the surface of the earth. He was sent to the surface as a spy to gather information in order to defeat the humans who are living there. But the problem is that Majins have a different understanding about humans; they strongly believe that the Human Race is far superior to them in every sort of way, but in fact it is the other way around. How can Luchiru survive in the Human World where he has different point of views on the strength of humans, which he strongly believes that with just a touch would make him combust and be disintegrated in an instant?!
It is the manga Umezawa made before his very succesful follow-up BOY and which tells of the adventures of Hibino, delinquent son of God. God gets enough of his son's behaviour and sends him down to earth to better his life and test him. The outcome of this will determine the future of the world, because God won't have his son succeeding him if he doesn't better his life and will end humanity if Hibino fails.