A world of endless demonic civil war - the Demon Realm. The strongest among the demons known as "Demon Lords" battle day-and-night for control over the realm.

Kirika and Masha, maids who serve the Demon Lord Maxim, return to their castle to find it destroyed by a rival lord, Lyzenorg. As the only surviving vassals, Kirika and Masha must adventure together with their master Maxim, reduced to a shell of his former self, in order to restore him to glory.
 
Their story of revenge and revival begins here!

• Gal*Gun-vania: Now a full-realized metroidvania, uncover countless combos and possibilities as you explore the Demon Realm with your two upgradeable characters.
• Revive Your Allies: Each of Maxim’s vassals you find and revive will strengthen your home base, the Demon Lord’s castle! As you rebuild, unlock bonus features which assist you on your quest for revenge.
• Sister Power: Kirika and Masha, the two sister maid heroines, each bring their own unique gameplay styles. One attacks with demonic guns whilst the other covers close range attacks with her whip!
• Couch and Online Co-op: play together locally or online, each player controlling a sister, opening countless possibilities to discover new places or defeat difficult enemies through teamwork.
  Collect and Craft: Defeating enemies and discovering chests will earn you random drops of consumable items, sub-weapons, and even passive enhancements called “Demon Relics”. Use these items to unlock new special abilities needed to access new areas of the map.
• Choose your “Style”: Inheriting the “Style” system of its predecessor, you can choose to play “Casual”, “Veteran”, or “Legend” modes, available to switch between at any time with unified content across all modes.