In the video game world of Goemon, the evil Makuamuuge has concocted a nefarious plan: to take over the human world! To facilitate the takeover he sends the dashing Harakiri Seppukumaru; with Seppukumaru’s help, a portal can be created that will allow Makuamuuge to complete his plans. However, hope exists for mankind: the ninja Goemon, who fell into young Tsukasa’s life through a computer monitor! Along with the machine-savvy Monoshiri and a giant robot, Goemon will battle Seppukumaru and his evil monsters and save the human world from destruction!