Practically everyone but FTV has had something to say about this, so I thought it was about time. Welcome to ai sp@ce, a 3D massively multiplayer online social game ala Second Life, but instead of mimicking the real world, ai sp@ce mimics the bishoujo game world. Three worlds in fact: Clannad, Shuffle!, and Da Capo II.
In this game, players can customize their avatars and choose a personal "character doll" or "chara-doll", which is one of the heroines featured in the three visual novels listed above; so far, only Nagisa (Clannad), Sia (Shuffle!), and Otome (Da Capo II) have been revealed. The player gets the chance to live with his chara-doll in a house on one of the game's three "islands" which are designed to look like the worlds in Clannad, Shuffle!, and Da Capo II; for example, the Da Capo II world has sakura trees in bloom all over the place. The islands are connected by a central "Akihabara Island" where the players and their chara-dolls can interact with other players of the game in chatting and events. The player can teach his chara-doll various things, such as memorizing motions to act out, dancing, and developing a unique personality for each user, as the development company claims. The player can also buy clothes and accessories for him and the chara-doll to wear, and buy other things for the house, such as furniture.
Details on the game can be found at Wikipedia and the game's official website. A preview video has been uploaded to YouTube. The game is due to be launched this summer, and the first theme song will be by Kotoko. And some sample screenshots: