Hyperdimension Neptunia is a Japanese Role-Playing game series which boasts innovative forms of customization that are often unheard of in other games. Among these are the abilities to create your own combat moves (thousands of them) complete with custom illustrations and custom character skins built using an external application.
The series' storyline is a clear analogy and personification of the competitions and alliances within the real-life game industry - one which is quite readily apparent, with the name of the world being Gamindustri. Characters are modeled after video gaming hardware or hardware manufacturers. Character relationships and behaviors are reflective of the perceived nature of the gaming companies represented, and are often steeped in humor.
Exploration takes the form of a dungeon crawl, with the in-between sessions laid out like a traditional Japanese visual novel. Visual novel portions of the game are often filled with sexual innuendo and fan-service, although the story is at times serious. Combat is innovative and fast-paced, and highly customizable.