The Michelin Guide unveiled Thursday its ratings for hotels in Japan for the first time, with six facilities receiving the maximum three “keys,” a designation similar to stars for restaurants. Among the six that received the highest rating for promising an “extraordinary stay” are Gora Kadan in the famous hot spring area of Hakone near Tokyo and Palace Hotel Tokyo, according to Nihon Michelin Tire Co. The announcement comes after the Michelin Guide released its new ratings for hotels first in France in April this year and then the United States, Spain and Italy. Japan became the fifth country …