Six Gravity is an idol band, led by a giant rabbit! Their adventures are popular across anime and manga in Japan, and Tsukiuta 12 Memories, a Vita exclusive game sees them suffer from some strange form of amnesia. Someone's got to recall their memories through some light visual novel style adventuring, other than that not much has been given away in this first reveal.
The game is due for Spring in Japan, not sure this is popular or deep enough to merit a wider release. There's a few pics on the official website, expect more to come.