Hakuoki: Demon of the Fleeting Blossom.
The Hakuoki series is part of the otome (female market-targeted) visual novel subgenre, offering a harem of cuddly warriors for players to woo in a 19th-century Japanese setting. While Aksys released the Dynasty Warriors-like spinoff Hakuoki: Warriors of the Shinsengumi for the PSP earlier this year, the upcoming Stories of the Shinsengumi sticks closer to the series' roots, featuring text-based gameplay that focuses entirely on dialogue choices and branching narrative.
Aksys recently announced that it will also bring the Nintendo 3DS series sequel Hakuoki: Memories of the Shinsengumi stateside. A release date for Stories of the Shinsengumi has not been announced.