Oreimo is also getting an anime some time this month. (Above artwork is from the anime version.)

My little sister, too cute to believe, is coming out on a date that's also quite difficult to believe. Namco Bandai has announced a January 27 date for My Little Sister Can't Possibly Be This Cute Portable, a PSP adaptation of a like-named novel. January 27 is, of course, Valkyria Chronicles 3 day. I'm going to have to keep My Little Sister boxed up until I've had my fill of Sega's strategy sequel.

My Little Sister Can't Possibly Be This Cute Portable -- also called "Oreimo" in short -- will be available in two forms. The standard pack, known as the "Always Together Pack" comes in a special box and includes a short story and game art collection booklet. This is priced ¥6,804.

The "Love 'My' Little Sister Box" limited edition, priced ¥11,004, includes the following:

• A special box
• The same art and short story book as the standard edition
• A special cut anime DVD
• A Poster set
• A UMD copy of "Ore no Imouto Meika EX: Imouto to Koishiyo Portable"

That last item is a PlayStation Portable adaptation of a game that appears in the original Oreimo novel. As detailed in the novel (not that I've read it or anything -- I'm just going by the Wikipedia entry), Imouto to Koishiyo (Love My Little Sister) is an adult adventure game that's owned by Kirino, your little sister. The game has six little sisters as heroines, all voiced. It's said to be a game that makes you cry. There's an official site just for the PSP adaptation, which is exclusive to the limited edition.

Both versions of the game will include the "How to Imoutalk" DVD, which contains a series of lessons where Kirino will speak the lines of Kyosuke, her big brother and your in-game character. This will apparently teach you how to speak like Kirino ("Imoutalk" is a play on "little sister" and "talk"). These conversations will all be shown using the game's Live2D animation system.

Joining the release details, the Oreimo official site was given a refresh today. It now has some content detailing the game and characters.

In the "character" section, you'll find introductions to two characters: Kirino and Kuroneko. Kirino is, as mentioned above, your little sister. She's a junior high school student, an all around ace, but is secretly into anime, games and other "otaku" type things. Kuroneko, whose name literally means "Black Cat," meets Kirino at an offline meeting for their SNS community "Otaku Girls Gather." She's more otaku than Kirino, as she has her own blog, is active in the circle, and always dresses in goth.

The site's "system" section has details on the game's O.I.U. system. This stands for, translated to English, "My Little Sister Can't Possibly Move Like This." It's basically an animation system that uses Live2D technology for smooth motion. Read more about Live2D here.