Birthdate: December 10th, 1979
Height: 5'9"
Weight: 220 lbs.
Debut: September 11th, 1999
Formally: Kazuya Yuasa
Background: Michinoku Pro student
Alliances: None
Ring Attire: Short tights

Signature Moves:
- GAINA Cutter
- German Suplex Hold
- Naruto Strait
- Northern Lights Suplex
- Powerbomb
- Southern Cross

Signature Moves (as Shisaou):
- Shisa Bomb

GAINA started his career using his real name, Kazuya Yuasa, in Michinoku Pro. He participated in the Super J Cup 2004, and a few months later he took second place in the NJPW Young Lions Cup. In 2006 GAINA moved to Osaka Pro, where he soon became the top heel of the promotion. GAINA joined the newborn Okinawa Pro in 2008, changing his ring name to Shisaou.

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