No it's not a spaceship, or a game show set, or even the backdrop to a J-pop music video. It's an immersive advertisement for gaming.
Called the flatflat store, the space was created in a very long, narrow space by Sako Architects to sell game products from NHN Japan. Visitors to the store get instant access to hangame, an online games portal, and hange.jp, a games portal for mobiles. Walk in and use one of the store's big-screen interfaces to the portal, or just open up your mobile device and start playing.
All well and good, but I don't see an espresso machine anywhere . . .