The stage is the near future ( 2036 ). The martial art "Striking" between manned robots with a total height of over 6m called "Duel Gear" has gained worldwide popularity.

A new warrior debuts to defeat Kaiser and his Duel Gear Siegfried, who stands at the top. Designed by Hans and driven by Kou, it is Gaira, the "Deity of Fire".

Kou and Gaira as a team "Kurehiryu" (Crimson Dragon) win the league match smoothly.

Kou and Hans had a reason to aim to overthrow the champion Kaiser. Kaiser has a past as a mercenary, and was the one who blew up the field hospital where Kou and Hans' parents worked with a missile.

Team "Red Scarlet Dragon" participated in the open league match "Goddess Cup" that bet on the right to challenge Kaiser, but in front of Kou and Gaira, the formidable enemy Izayoi Jin and the "Dark Monster Bird" Crow. stood in my way.