Ultraman Chou Toushi Gekiden is a Game Boy title based on the Ultraman franchise, released in Japan. The term 'Chou Toushi Gekiden' suggests intense, super-soldier-themed action.  Given the Game Boy's capabilities, the game would likely feature side-scrolling action, combat, and perhaps some elements of the Ultraman universe.  Details on specific gameplay and the developing company remain to be researched.

Ultraman Chou Toushi Gekiden (Japan)

Ultraman (Japan)