Squaresoft (now known as Square Enix) didn't only make role-playing games! They also made games of different genres. This one is a shoot'em up called Einhänder.
This shooting game has something particular compared to its siblings. Not only can the player shoot bullets, but he can also wield a sword and slash through enemies. In fact, the game's title, Einhänder, means "single-handed" in German, referring to the player's sword.
In this movie, sparky takes advantage of a glitch to abuse the weapon's attack to cause more damage. This is only possible in the Japanese version.