The Ultimate Attack! Duel With Master Asia is the thirty ninth episode in Mobile Fighter G Gundam.
Domon goes looking for Allenby because she went missing. He yelled at Rain because she was supposed to look after Allenby. Fuun Saiki, Master Asia's horse, comes and delivers Domon to Master Asia.
Wong hears of this and releases a Gundam head to kill Domon and Master Asia. The two fighters get stuck below ground and call a temporary truce until they find the surface.
Master Asia teaches Domon the Sekiha Tenkyoken, and when they reach the surface Domon disposes of the Gundam heads with ease.
Meanwhile, back in the Neo Japan consulate, it is discovered that Rain resigned as a member of the Gundam team.