After graduating Ginowan High School in 1999, he joined J2 League side Kawasaki Frontale. He made his professional debut on May 2, 1999 against Vegalta Sendai. His first professional goal came on May 13, 2000 against Nagoya Grampus Eight. Frontale won the champions in 1999 season and was promoted to J1 League. However the club was finished at bottom place in J1 in 2000 season and was returned to J2 in a year. In 2003, he became a regular forward. In 2004, he scored 22 goals and he was the 2nd top J2 League scorer. He helped lead Frontale to the J2 League championship and Frontale was promoted to J1. In 2006, he scored 18 goals and he was the 3rd top J1 League scorer. Frontale also finished at the 2nd place in 2006 season. However his opportunity to play decreased from 2007 season.
During the 2007 season, Ganaha was suspended for six games due to alleged infringement of the anti-doping code by intravenous therapy with saline solution and vitamin B1, due to dehydration and inability to take fluids orally. Ganaha appealed the case to the Court of Arbitration for Sport (CAS) in December 2007, and on May 26, 2008, CAS issued a ruling supporting him and to have the six game suspension reversed.
Ganaha transferred the register to Vissel Kobe in 2009. Although he played in 2 seasons, he could not play many matches and he could only scored a goal in 2009 J.League Cup.

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