Demon of Steel: Battle of the Great Demon Beasts (1987)

In the year 1999, a team of UN scientists in an attempt to tap into a new energy resource on a deserted island called Samsara, unknownigly open a portal to another universe, unleashing dormant biomechanical entities. Three years later, Takuya Goroza returns to the island of Sansara urged by a mysterious request by college chum Haruka Alford. Little does he know, his old friend isn't what he appears to be...