The Killing Blade Plus (V300) is likely an enhanced version of The Killing Blade arcade game, with 'V300' signifying a more advanced iteration.  The 'Plus' addition suggests additions or improvements to the original game's features.  This could include new game modes, characters, levels, or enhanced graphics and gameplay mechanics.  Finding details about the specific publisher and its release date requires further research.  Further information is needed to know precisely what elements were added in this version.

The Killing Blade Plus (V300)

The Karate Tournament (Japan)