Sushi King except for their Soy sauce.

There's one at Jaya 33. It's called Ramen Ten & Shin. Apparently it's Singapore's 1st halal Japanese restaurant.

Try searching on Seemou. It's an app that gives out discounts for eateries and you can even search for nearby places
https://play.google.com/store/apps/details?...m.utopia.seemou
http://seemouofficial.blogspot.com/

Many nice Japanese restaurants are pork free but they have to keep alcohol for japanese customers that's why can not obtain halal certificate.

ichiban ramen is very good, many chinese would eat there. i myself can't let go even the last drop of soup. their chicken chashu ramen really nice. their pot stickers/dumping also very good.

there's an authentic japanese restaurant at the ground floor of plaza masalam shah alam, a lot of japanese customers dining there. a highly recommended place. but they have separate counter for alcohol.

imo sushi king is like pirated dvd, i wouldn't go there. i'd rather buy sushi from jusco aeon if i must.