It's not actually sake, but shochu. It's similar to sake but made from barley, and once you're drunk, do you really care what it is called?
Toho Co Ltd, the company that owns the rights to the Godzilla character, comissioned the Konishi Brewing Company to create a tie-in for the 55th anniversary of the Godzilla movies. Artist Nariaki Ito sculpted the Godzilla bottle, which is limited to 3000 editions. The price is 10,500 yen, which translates to roughly US$100. That's about all I can extrapolate about this product because the Japanese translation is almost as hard to read as the original Japanese. So enjoy these photos!