Hero Hero Kun is a Japanese Game Boy Color game. Given its title and region, it likely features a superhero theme with action-oriented gameplay. The specific mechanics are unknown without further details, but it could range from side-scrolling action to puzzle-solving.  The game's style is likely aimed at a Japanese audience and its release remained within that region. More information would be required to pinpoint the specific game developers and publishers involved in bringing this title to the Game Boy Color.

Hero Hero Kun (Japan)

Hello Kitty to Dear Daniel no Dream Adventure (Japan)