go here for a walkthrough on setting up a Japan PlayStation Network account for your PS3. Mainichi Issyo has been (and still is) only available through the Japanese PlayStation Store. As reported during the firmware 3.50 release, the Remote Play functionality will allow Mainichi Issyo gamers to "interact with Toro the cat" through any available internet access point. New details unveil the game's unique ability to complete microtransactions through the PlayStation Store in-game, instead of dumping you out to the PSP built-in browser. Feel free to have yourself a look-see. We'll be sure to update you with our in-depth impressions on Remote Play, as promised.
[Update: Changed the wording of the post to reflect the newly unveiled features within Mainichi Issyo, using Remote Play. The post title changed to reflect the description of these new in-game features.]