What is the game about and is it recomendable?

It's a play on words about the console flame wars. Each domain is named after the console (Lastation, Leanbox, Lowee, and Planeptune)

Each has a CPU goddess who do quests to build shares for their domain. These four are Neptune, Vert, Blanc, and Noire. Each represent at least some stereotypical form of the real world fanbase for each console (aside from Neptune and her domain, Planeptune, as Sega dropped from the console market before fully realizing their next console, the Sega Neptune).

Then there are multiple other characters that hold important to the franchise, but are also just characters representing a company in the game industry (IF, Compa, Gust, Nisa [these four are actually part of the development teams for the actual game. (speaking of game industry, the overworld in which these domains live in is called Game Industri) 

Also, all the characters are girls. If you're into the way the story's laid out and the personalities of each character, I'd go for it. Because no matter what, the gameplay isn't at its greatest when it comes to the games NIS publishes.

It's alright. I've only played the first installment, and its gameplay is engaging enough for me to not hate it, but it's nothing special. Areas and enemies get copy-pasted quite a bit, and side-quests are divided between kill this amount of monsters, or find this amount of loot. But the characters have some charm and there are a lot of game references that made me both facepalm and laugh. So I guess give it a try and you'll find out pretty quickly if you like it or not.

I just got gifted Hyperdimension Neptunia Re;Birth1 on Steam, and despite having an annoying title, the game's pretty rad. It's a turned based RPG in exactly the way I've always wanted- actual turn based meaning no ATB bullshit, the ability to position allies withing a certain range to make their attacks the most effective, modifiable combos to use when attacking, a convenient meter on the top right that lets you know what ally or enemy is moving next for the future several turns... it's the perfect kind of battle system for this genre, if you ask me.

 

Downsides are it's really grind heavy; I've only payed for about 5 hours so far, and 3 of them have been grinding in side-quests (from what friends tell me, that's pretty consistent throughout the whole game). The game doesn't do a great job of explaining how all the mechanics work- there are tutorial screens that pop up, but they're a lot of information at once and it's hard remember which screen explained what mechanic.

 

Oh, and the game is ecchi as firetruck- lots of nearly naked girls or strategic positioning of camera to look up girl's skirts or down their shirts, the 2-D image cutscenes adding tons of boob jiggle even to characters that don't have boobs, characters magically transforming into goddesses that just so happen to wear skintight revealing outfits, that sort of shit. So you really have to be okay with that sort of thing to ever play this game.

 

Oh, and the voice of Neptune is the same actor who voiced Rika in the English dub of Digimon Tamers, so that's cool as hell too.