Marukai is a store similar to Mitsuwa. I'm not sure if they are also a chain. As for food they have more selection than the Costa Mesa Mitsuwa and they have better prices. They require a $10 membership but generally you'll save more than $10 over Mitsuwa on your first trip.
They also have some Hawaiian foods although they are all frozen. They have pork, chicken and fish lau−laus and they have kalua pork and kalua chicken as well as some poke mix and laup−chong (a sweet sausage that Hawaiians like especially in fried rice)
Directions: Take the 91 Fwy west until it ends just past the 110. It becomes Artisia Blvd. Keep going west on Artisia to Western. Make a U−Turn then turn right into Marukai. OR, Take 405 and exit on Artisia East or Western North. Marukai is at the corner of Western and Artisia. Note: don't mistake the Marukai 99 cent store that's about a mile east of Western.
I've been told there is now a Marukai in Orange County too.