Daikaijuu Deburas (Japan) is likely an action or adventure game on the NES, focusing on the giant monster, Deburas. Gameplay possibly involves battling Deburas directly or fighting monsters in Deburas's world.  The details require researching Japanese NES game releases and archives to discover the precise gameplay mechanics and developer.

Daikaijuu Deburas (Japan)

Dai Meiro - Meikyuu no Tatsujin (Japan)