This Japanese dining establishment in LA has actually stayed in business for 66 years without advertising. Otomisan, owned by Yayoi Watanabe, declares to be the last Japanese restaurant in the Los Angeles Boyle Heights location. Some residents don't even understand it exists. Still, those who do, flock there for the tempura, udon, oyakodon bowls, and karaage. VICE met Watanabe and learned how she went from being a dry-cleaner owner to the face of one of the location's…