Gaiking: Legend of Daiku-Maryu

A boy, Tsuwabaki Daiya found a black fire in an ocean when he and his father were in a small boat. A big monster came out of the fire, and the father and the crews were disappeared into the sea. When he was about to become the next victim, a large mecka dragon appeared and saved him.

5 years later since then, Daiya becomes a junior hi...