Excuse me, i like the anime very much and i have just found out that they have game version of this anime, i wonder can anyone tell me that this game is in english or jap ?

Wow, forgot about this area. This part of the forums is typically very barren, so answers can sometimes take a few days. Anyhow, yes, there are two games out right now. Sister Princess and Sister Princess 2 (Oh, and a GBA game). Also yes, these are all in Japanese. I own SP 2 and a modchip for it.

The GBA game you're referring to is 'Sister Princess Repure', which pretty much follows the anime in terms of storyline, although I never really got 'far' in it -_- Maybe I could put up a few screenshots if people really wanted to see what it's like.

Not to mention the Dreamcast variants for Sister Princess 1 and 2. There's also a side story thing for Playstation 1.

Each of the game had some nifty bonuses with the limited edition versions. Being that there are 12 sisters, most came with 12 key chains of them in some form or another.

Fans of the artist may notice that he(?) has also worked on Princess Maker 4.

Oh man, I have those keychains, totally forgot about those. Wonder where those are o_o