Why do they have a "B" grade from the Health Department?

Japanese restaurant

12200 Civic Center Dr, Norwalk, CA 90650, USA

Japanese restaurant

2550 S Archibald Ave Suite O, Ontario, CA 91761, USA

Japanese restaurant

10 N East St #100, Woodland, CA 95776, USA

Japanese restaurant

1381 E Las Tunas Dr, San Gabriel, CA 91776, USA

Japanese restaurant

1701 W Valley Blvd, Alhambra, CA 91803, USA

Japanese restaurant

11651 Santa Monica Blvd, Los Angeles, CA 90025, USA

Japanese restaurant

4001 Wilshire Blvd, Los Angeles, CA 90010, USA

Japanese restaurant

5498 California Ave, Bakersfield, CA 93309, USA