Gamble Fish

Gamble Fish (ギャンブルフィッシュ) is a Japanese manga written by Aoyama Hiromi and illustrated by Yamane Kazutoshi. Gamble Fish is serialized in Weekly Shōnen Champion. As of January 2010 fifteen tankōbon collecting the chapters were released, the first one on June 8, 2007, and the last one on January 8, 2010.

Plot
The story follows 14-year-old Tomu Shirasagi, son of the infamous swindler Yumeichirou Shirasagi. He goes to Shishidou academy, a school attended mainly by the rich and influential, from a public High School, instead of a private one, for which he is snubbed (mostly by the male students with the female students having some kind of interest with him, though secretly), but not for long. He quickly reveals that he is not a normal student, but an expert con artist in an encounter with Shishidou Mika, the great-granddaughter of the dean. He earns two allies in his roommate and class representative Mizuhara and another ally in Kimura Natsumi, a first-year student and self-proclaimed idol of Shishidou Academy. As the series progressed, a darker side of the academy comes to light, as it is revealed Shirasagi's father disappeared investigating the academy and that students who focus on things other than studying disappear and are jailed by Abidani without anyone investigating.