The increasing number of authentic Japanese restaurants or impending projects, as in straight out of Japan, is impressive right now.   Add one more to the list:  Window notices are up on the space next to Yazawa, at 9966A S. Santa Monica Blvd. in Beverly Hills, announcing a new restaurant, Ima.  The window promises shabu-shabu and sukiyaki, but their website lets us know that Tokyo-based Imafuku makes highest-grade Japanese Wagyu the star of the show.  And they’ll even let you know from what part of Japan the beef is coming, just in case you’re concerned about Fukushima.