A large but good-natured guy, he was part of Benkei's group when they ventured to the outside world after 13 years. After Benkei is injured by Invaders, he becomes pilot of Shin Getter-3. He is friends with Kei and seems to have a small crush on her. Gai is based on the character of Gai Daido from Getter Robo Go, but is different aside from appearance.

(Source: Wikipedia)