Pretty good ramen place in the Asian Fast Food Mall (Ranch 99 shopping center in Milpitas). It gets super crowded at lunch time so try before 11:45pm. After that they put your name down and you wait outside. I actually like their traditional ramen (miso, shoyu, etc) rather than their specialty black ramen.
Looks like they have another location in Mountain View on Castro as well.
530 Barber Lane, Milpitas, CA 95035