It's kind of hard to imagine why they would use this imagery if the game didn't have to do with Mahjong, but what do you make of it? Let us know in the comments.
Cave Interactive put up a new teaser site at 6meikan.jp. Silhouettes with shadows, and a date: 11/11/11:
At least we don't have long to wait! Cave is still most well-known for shoot'em-ups, but their new adventure game, Instant Brain, is due out in Japan for Xbox 360 on November 10th—the day before this reveal takes place.