Capcom's official Okami Facebook page is running a giveaway; first three to spot this lost-dog poster in New York will get a plush Chibi. See the page for details on submitting your entry.
The phone number is real. It connects to a voice mail asking you to bring Chibi to the address on the poster. And that address is the Javits centre, site of this weekend's Comic-Con NY.
Okamiden ... Can You Help Find Chibi in NYC? [Capcom-Unity]