Moe card games. I love 'em, you love ...oh, well Japan loves 'em. Compile Heart follows their successful card battler Monster Monpiece with another one, this time based on their videogame consoles-turned-girls Hyperdimension Neptunia franchise.
Neptune Collection will come to iOS and Android devices in Japan as a free-to-play release this February with 300 cards based on the RPG games. This game has you questing to up the value of the world you choose to be affiliated with SGCafe says that you'll meet the goddesses of the series in the game in events. Also, you'll be able to change character costumes by merging cards.
We'll probably never see this released here, I'm guessing.