PS4PS5 Hyperdimension Neptunia: Sisters vs. Sisters ‘Battle System Basics’ trailer A look at how combat works in the upcoming Neptunia RPG. Compile Heart has released a new trailer for RPG Hyperdimension Neptunia: Sisters vs. Sisters introducing the basics of the battle system. If you missed our coverage last week, read all about the game’s battle system here.Hyperdimension Neptunia: Sisters vs. Sisters is due out for PlayStation 5 and PlayStation 4 on April 21 in Japan. Read more about the game here. Watch the trailer below.