
Kantai Collection has been a standard card game that's swarmed with a massive amount of different "moe" ship-girls.
The fan-base has become absurd to nearly rival the Touhou fan-base. The game isn't easily playable since they integrated a "lottery" system for people to join.
Due to the popularity, an Anime was announced in the making a year ago for Summer 2014 but still no exact date is shown. (Crunchyroll stated that they will be airing it)
I can't come up with a synopsis simply because I have no idea if there's even a story or plot. Everything has been varied between fanon/canon, so it's too hard to tell.
I'm personally at a standstill since I have several mixed feelings about this "touhou-killer." Hell, depending on how good it is, I might migrate as well.
For those that have no clue on what I'm talking about, the two most popular subjects in Comiket is currently Touhou and KanColle by a wide margin. No other subjects come close to the two.