The former head of GAIL's Austral branch, he’s a self-serving man concerned with little beyond his own safety. He resents the bold and reformist approach of Rod, the newly appointed branch chief, and frequently opposes his orders. 

Austral Island is located 2,000 km south from Samoa islands. The existence of the island was removed from the official records, and Tagami Yu made a journey to search for the reason. 
He sailed for the island with Dr. Waive who was his father's friend, Doris who is the daughter of Dr. Waive, and Captain who is the friend of Dr. Waive. On their way to the island, GAIL, the international conglomerate, and gangster, Cougar Connection lead by Lady Lynx attacked them. 
They managed to arrive at the island, but suddenly a mysterious monster began to attack them. When they became ready for death, a blue giant robot appeared. It destroyed the monster and saved them. Although it was an existence far beyond human knowledge, it reminded Yu of something warm and familiar. 
It was Giant Gorg which is called "Messenger of the God" by the inhabitants of the island. Escaping from the attack of GAIL's assault team, Gorg guided Yu into the underworld. There, he found alien's relic and an alien who woke up after 30,000 years' sleep. 
(Source: AnimeNfo)

Samuel Gotou