On bustling Western Avenue in the heart of Gardena, Sakura-Ya and Chikara Mochi sit about 250 feet away from each other, frequented by South Bay residents for decades for fluffy mochi and cakey manju. They’re two of the only traditional Japanese mochi shops in L.A., with blink-and-you’ll-miss-it signage. Just a block away is Meiji Tofu Shop, a nearly 50-year-old producer that churns out fresh soy milk and tofu daily. Cross the street to find Otafuku — where the Akutsu family has been serving traditional Tokyo soba since 1997. You’ll find similar clusters of diverse Japanese food in strip malls across Gardena as well as Torrance, which has the largest East Asian population in all of L.A. The two neighboring cities are home to the biggest suburban Japanese community in the United States — and a decades-old restaurant landscape that feels like a time capsule, yet continues to flourish as a haven for classic Japanese cuisine and hospitality. “It’s like we’re stuck in the ’90s,” said South Bay native Daniel Son, the chef and owner of …