The story begins with a young and somewhat inexperienced trainer named Kaito. Kaito has always been fascinated by the world of Pokémon and has spent years exploring the various regions, catching a wide array of Pokémon, and battling other trainers to test his skills. However, Kaito's adventures take an unexpected turn when he stumbles upon an old, somewhat mysterious game cartridge labeled "Pokémon Ecchi Version" in a dusty corner of an old shop in a remote part of the Johto region.

Over the years, dedicated Pokémon fans have been searching for concrete evidence of Pokémon Ecchi Version. They have scoured online archives, scanned old Pokémon magazines, and even attempted to interview former Game Freak employees. While some leads have panned out, none have provided definitive proof of the game's existence.