Bakumatsu Will Be The First PSP Title To Experiment With The "Freemium" Model.

The title, Bakumatsu Revolution, will be a free download from the PSN including a full 10-hour campaign. Additionally, IGN reports that players will be able to share the game via wireless connectivity. That's almost viral.

Of course, while the game's very core will be free, further content will come as part of a paid model. The freemium model has been very successful in Asia so it makes sense to bring it over to a system such as the PSP.

The game's due out on June 25th in Japan. We're sure a lot of other publishers will have their eyes on it.