Gojira no gyakushû

Koji Kobayashi's plane crashes on a deserted island, where he's rescued by his friend Shoichi Tsukioka. They soon stumble upon a colossal battle between two giants: Godzilla, the familiar monster, and Anguirus, a prehistoric behemoth. Racing back to Japan, they warn authorities of the impending disaster. With no weapon to defeat Godzilla, Japan frantically develops countermeasures to divert the monsters away from Osaka, bracing for the worst as the city faces another terrifying encounter with Godzilla.