This anime is based on the game franchise Hyperdimension Neptunia by Compile Heart and Idea Factory. The story is standalone and takes place in an alternate continuity, having played the games beforehand definitely makes the anime easier to appreciate. Especially when it comes to recognizing the characters and knowing their personalities. However, even if you have never played the games, reading the anime's synopsis can help you understand the basic premise and follow the story more easily. The anime does contain some fan service and suggestive scenes, but it avoids full nudity, unlike what you would typically see in an ecchi anime. The animation itself is pretty decent, especially considering that the anime was released in 2013. Overall, I think it is worth checking out if you're already a fan of Hyperdimension Neptunia or just interested in the characters.