Zetman

Zetman is a manga created by Masakazu Katsura. It's been published weekly since 2002 in the Japanese magazine Young Jump. More than 100 chapters collected in 11 volumes have been published so far. Zetman's plot spans a period of 20 years of time mixing present, with Jin's evolution (The main character. An orphan kid whose foster father was murdered by a monster) and Kanzaki's past (and the mysterious origin of Jin). Jin will discover changes within himself. Every time he gets angry, a superhuman strength grows uncontrollably. Meanwhile, the president of the Amagi Corporation is in the search of a being called ZET.It can be recognized by a circular mark on his hand. Once he finds him, a disconcerting investigation to find out all about ZET gets started. The story focus on mutants known as "players" who have superhuman abilities. Thus, as the story progresses, Jin turns into a superhero who fight against these "players" and also against his own inner monster, ZET.