Hunter × Hunter (ハンター×ハンター), is a Japanese manga series written and illustrated by Yoshihiro Togashi. As of April 2012, 320 chapters have been published in 30 tankōbon (chapter collections) in Japan. However, the manga has frequently gone on hiatus since 2006.

In 1999, the manga series was adapted into a 62-episode television anime series produced by Nippon Animation and directed by Kazuhiro Furuhashi. Three separate original video animations (OVAs) totaling 30 episodes were subsequently produced by Nippon Animation and released in Japan from 2002 to 2004.

A second anime television series by Madhouse began airing on Nippon Television in October 2011. An upcoming anime film adaptation, featuring an original story, was also announced in March 2012.

Apart from these, there are also numerous audio albums, video games, musicals and other media based on Hunter × Hunter.

Story:
The story focuses on a young boy named Gon, who discovers that his father, whom he was told was dead, is actually alive and well. He learns that his father, Ging, is a world-renowned Hunter: a licensed profession for those who specialize in fantastic pursuits such as locating rare or unidentified animal species, treasure hunting, surveying unexplored enclaves, or hunting down lawless individuals. Despite Ging having left his son with his relatives in order to pursue his own dreams, Gon departs upon a journey to follow in his father's footsteps, pass the rigorous Hunter Examination, and eventually find his father. Along the way, Gon meets various other kinds of Hunters and also encounters the paranormal.

Source:Wikipedia