Career
He is a right-footed forward. After graduating Ginowan High School in 1999, he joined J. League Division 2 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.
He transferred the register to Vissel Kobe in 2009. He made his senior national team debut on August 9, 2006, in a friendly against Trinidad and Tobago, the first match under the reign of new national coach Ivica Osim.
He is the first Okinawa-born football player to play for the Japanese National Team. He also scored 2 goals in another qualifier against Saudi Arabia.
During the 2007 season he 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 (Chemical Abstracts Service) in December 2007, and on May 26, 2008, Chemical Abstracts Service issued a ruling supporting him and to have the six game suspension reversed.