I'll keep it short and sweet for all you guys. I provided links to each website for you to make reservations. Enjoy!
3 locations:
Santa Monica
West Hollywood
Pasadena
899 E. Del Mar Blvd
Pasadena, CA 91106
Phone: (626) 844-8900
Personally I've only been to the West Hollywood one which was a nice romantic setting.
8450 W 3rd St
Los Angeles, CA 90048 (323) 852-9400
Katsuya
I like the one on Hollywood and Highland because they had a special menu for Valentines day.
6300 Hollywood Boulevard
Los Angeles, CA 90028
323.515.8782
Yamashiro
1999 N Sycamore Ave
Hollywood, CA 90068
Velvet Margarita
1612 N Cahuenga Blvd Los Angeles, CA 90028
Hope this helps, feel free to comment below with any questions. Happy Valentines Day!