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BEST RATED FULLERTON, CA JAPANESE RESTAURANTS

3 Best Japanese Restaurants in Fullerton, CA

Expert-recommended Top 3 Japanese Restaurants in Fullerton, California. All of our japanese restaurants actually face a rigorous 50-Point Inspection, which includes customer reviews, history, complaints, ratings, satisfaction, trust, cost and general excellence. You deserve only the best!

What's Up Japanese Noodles - Fullerton, CA Japanese Restaurants - Dish Image
What's Up Japanese Noodles - Fullerton, CA Japanese Restaurants - Restaurant Entrance Image
What's Up Japanese Noodles - Fullerton, CA Japanese Restaurants - Service Highlights
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10+ YEARS IN TBR
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WHAT'S UP JAPANESE NOODLES

(5.0 Score)
512 North State College Boulevard,
Fullerton, CA 92831 Directions

Since 2011

Specialty:

✓ Aka ✓ Cha ✓ Kuro ✓ Shiro ✓ Chuka ✓ Tanmen ✓ Sara ✓ Chanpon ✓ Vegan ✓ Broth Only ✓ Special ✓ Tsukemen ✓ Shio!! ✓ Gyokai Kuro ✓ Omakase ✓ Gyu Don ✓ Pfr ✓ Chashu Don ✓ Ch Teri Don ✓ Mabo Don ✓ Buta Kim Don ✓ Spicy Tuna Don ✓ Ch Soup ✓ Mochi Matcha ✓ Mochi Mango ✓ Mochi Strawberry ✓ Almond Pudding ✓ Age Potato ✓ Agedashi Tofu ✓ Buta and Kim Ap ✓ California Roll ✓ Edamame ✓ Gyoza ✓ Gyutan ✓ Ika Rings ✓ Karaage ✓ Kimchi ✓ Spicy Tuna Roll ✓ Takoyaki ✓ Yasai Itame

"What's Up Japanese Noodles is an authentic and unpretentious Japanese restaurant that specializes in flavorful ramen and udon bowls. The restaurant is located at Chapman Avenue Shopping Center. Their relentless dedication to providing an exceptional dining experience has garnered them a devoted following among Japanese cuisine enthusiasts. The restaurant's inviting and warm atmosphere sets the stage for any gathering or special occasion. The attentive and friendly staff at What's Up Japanese Noodles always deliver outstanding service, ensuring that your dining experience is nothing short of delightful. With Japanese dishes brimming with flavor and unmatched quality, What's Up Japanese Noodles is the ultimate destination. What's Up Japanese Noodles accepts payments via credit cards and debit cards.

2026 Update: What's Up Japanese Noodles offers vegan options, outdoor seating and in-store pickup."

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License #6483516

Price:

Ramen
Aka: $19.94
Cha: $18.69
Kuro: $18.69
Shiro: $18.69
Chuka: $17.44
Tanmen: $18.69
Sara: $21.19
Chanpon: $21.19
Vegan: $20.62
Broth Only: $9.38
Special: $18.69
Tsukemen: $21.25
Shio!!: $17.50
Gyokai Kuro: $18.69
Omakase: $22.50
Donburi
Gyu Don: $15.62
Pfr: $13.75
12 Pfr: $7.50
Kfr: $15.00
12 Kfr: $8.12
Chashu Don: $15.62
12 Chashu Don: $8.12
12 Gyu Don: $8.12
Curry: $15.00
12 Curry: $8.12
Ch Teri Don: $15.00
12 Ch Teri Don: $8.12
Mabo Don: $15.00
12 Mabo Don: $8.12
Butakim Don: $15.00
12 Butakim Don: $8.12
Spicy Tuna Don: $16.25
12 Spicy Tuna Don: $8.12
Ch Soup: $3.12
Desserts
Mochi Matcha: $3.12
Mochi Mango: $3.12
Mochi Strawberry: $3.12
Almond Pudding: $5.00
Appetizers
Age Potato: $9.38

Contact:

(714) 526-5966

Mon-Sun: 11am - 1am

TBR® Inspection Report:

Kopan Sushi & Ramen - Fullerton, CA Japanese Restaurants - Dish Image
Kopan Sushi & Ramen - Fullerton, CA Japanese Restaurants - Restaurant Entrance Image
Kopan Sushi & Ramen - Fullerton, CA Japanese Restaurants - Service Highlights
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10+ YEARS IN TBR
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KOPAN SUSHI & RAMEN

(4.9 Score)
141 East Commonwealth Avenue,
Fullerton, CA 92832 Directions

Since 2013

Specialty:

✓ Kara Miso Ramen ✓ Kuro Mayu Ramen ✓ Vegan Ramen ✓ Tonkotsu Ramen ✓ Cutlet Ramen ✓ Yellowtail Jalapeno ✓ Garlic Lover's Albacore ✓ Mango Salmon Special ✓ Truffle Salmon Blue Crab ✓ Jessica Albacore ✓ Yuzu Salmon Donburi ✓ Unagi Donburi ✓ Baked Crawfish Roll ✓ Dragon Roll ✓ Volcano Roll ✓ Baked Salmon Roll ✓ Sapporo Roll ✓ Snowcone Roll ✓ Caterpillar Roll ✓ Bscr ✓ Lemon Roll ✓ Rainbow Roll ✓ Protein Roll ✓ Super Philly Roll ✓ Red Dragon Roll ✓ Mango Lover Roll ✓ Cajun Tuna Roll ✓ Baja California Roll ✓ Stuffed Avocado ✓ Calamari Rings ✓ Crispy Rice W/ Spicy Tuna ✓ Chicken Karaage ✓ Cucumber Avocado Salad ✓ Jalapeno Bomb ✓ Takoyaki ✓ Seaweed Salad ✓ King Mushroom Steak

"Kopan Sushi & Ramen is a traditional Japanese restaurant that takes pride in its authentic flavors. Their signature Tonkotsu broth is carefully prepared by simmering pork for 16 hours over a searing flame, resulting in a rich and robust flavor that takes center stage at Kopan. Their thick and creamy broth, derived from boiling pork bones, fat, and collagen over high heat for an extended period, offers a hearty and satisfying experience. For those seeking a lighter option, the Vegetable Ramen is a wholesome delight crafted entirely from a vegetable base, showcasing a harmonious blend of flavors from the bountiful garden. Kopan Sushi & Ramen offers happy-hour food for customers. Whether you're a vegetarian or simply craving a lighter palate after a chilly day, this all-veggie creation is sure to please. Kopan Sushi & Ramen is wheelchair-accessible and offers free parking facilities.

2026 Update: Kopan Sushi & Ramen offers online orders, pickup, and delivery options."

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License #4119416

Price:

RAMEN:
Kara Miso Ramen: $17.95
Kuro Mayu Ramen: $16.95
Vegan Ramen: $14.95
Tonkotsu Ramen: $16.00
Cutlet Ramen: $20.95
SIGNATURE DISH:
Yellowtail Jalapeno: $20.64
Garlic Lover'S Albacore: $20.64
Mango Salmon Special: $20.64
Truffle Salmon Blue Crab: $22.94
Jessica Albacore: $20.64
Yuzu Salmon Donburi: $21.79
Unagi Donburi: $21.79
Baked Crawfish Roll: $19.49
Dragon Roll: $19.49
Volcano Roll: $19.49
Baked Salmon Roll: $19.26
Sapporo Roll: $19.83
Snowcone Roll: $19.83
Caterpillar Roll: $18.34
Bscr: $18.97
Lemon Roll: $20.13
Rainbow Roll: $20.13
Protein Roll: $20.41
Super Philly Roll: $20.13
Red Dragon Roll: $20.13
Mango Lover Roll: $19.84
Cajun Tuna Roll: $18.98
Baja California Roll: $19.84
Stuffed Avocado: $9.14
Calamari Rings: $13.23
Takoyaki: $10.29

Contact:

(714) 447-9926

Sun-Thu: 11:30am - 11pm
Fri & Sat: 11:30am - 12am

TBR® Inspection Report:

Roll & Grill - Fullerton, CA Japanese Restaurants
Roll & Grill - Fullerton, CA Japanese Restaurants
Roll & Grill - Fullerton, CA Japanese Restaurants
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ROLL & GRILL

(4.8 Score)
1308 E Chapman Avenue,
Fullerton, CA 92831 Directions

Since 2015

Specialty:

✓ Chicken Bowl ✓ Beef Bowl ✓ Chicken and Beef Bowl ✓ Chicken Plate ✓ Beef Plate ✓ Chicken and Beef Plate ✓ Salmon Plate ✓ Plain Udon ✓ Chicken Udon ✓ Shrimp Tempura Udon ✓ Fresh Roul ✓ Amg. ✓ Alaskan ✓ Colornia ✓ Hawall ✓ Ken's Special ✓ Spicy Tuna ✓ Avocado and Cucumber ✓ Avocada ✓ Cucumber ✓ Crunch Dragon ✓ King Tiger ✓ Lakers ✓ Lettuce ✓ Red Dragon ✓ Salmon Tempura ✓ Spicy Tuna Tempura ✓ Spider ✓ Vegetable Tempura ✓ California ✓ Crunch ✓ Salmon Skin ✓ Spicy Tuna ✓ Salmon ✓ Baby Lobster ✓ Albacore ✓ Spicy Seared Albacore ✓ Tuna

“2026 Update: Roll & Grill offers a wide range of grilled meats, bowls, plates, lunch combo meals, and California rolls. The restaurant is located in Post Office Village. Roll & Grill has serves various flavours of Udon noodle bowls. They provide in-store pickup options for the customers' benefit. The restaurants' recommended dishes are the Yummy teriyaki beef plate, hand rolls, baked salmon, beef plate, chicken plate and crunch roll. Roll & Grill provides plenty of parking, takeout, accepts credit cards, dine-in and wheelchair accessibility. The restaurant provides fresh and good portions at very fair and reasonable prices.”

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License #B20250052011

Price:

BOWLS & PLATES
Chicken Bowl: $6.00
Beef Bowl: $6.00
Chicken and Beef Bowl: $7.00
Chicken Plate: $7.00
Beef Plate: $7.50
Chicken and Beef Plate: $8.50
Salmon Plate: $8.50
UDON
Plain Udon: $6.00
Chicken Udon: $7.00
Shrimp Tempura Udon: $8.00
TEMPURA
Fresh Roul: $9.00
Amg.: $8.00
Alaskan: $8.00
Colornia: $8.00
Hawall: $11.00
Ken's Special: $15.75
Spicy Tuna: $9.00
Avocado and Cucumber: $3.50
Avocada: $3.00
Cucumber: $5.75
Crunch Dragon: $8.00
King Tiger: $9.00
Lakers: $6.25
Lettuce: $7.50
Red Dragon: $10.00
Salmon Tempura: $6.50
Spicy Tuna Tempura: $8.00
Vegetable Tempura: $6.00
BAKE
California: $2.75
Crunch: $3.75
Salmon Skin: $2.75
Spicy Tuna: $3.25
Salmon: $3.25
Baby Lobster: $9.00
HAND ROLL
Sushi (2pc): $3.00
Salmon: $3.00

Contact:

(714) 879-5588

Mon-Fri: 11am - 7:45pm
Sat: 11am - 3pmI4:30pm - 7:45pm
Sun: Closed

TBR® Inspection Report:

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WHAT'S UP JAPANESE NOODLES REVIEWS

This ramen restaurant is so good!!! We ordered the Kuro Ramen and Spicy Miso Ramen. Kuro Ramen was a bit too salty for us and the Spicy Miso Ramen is less salty but still a bit salty so I had to pour a bit of water in to match my taste. One thing that I freaking love is the noodle because they are chewy and just taste so much better compared to any ramen restaurant that I have been to. I am highly and strongly recommend this restaurant.

I’ve been here on multiple occasions to order takeout after a cheat day from my regular chipotle after the gym and the one thing I can count on is that the staff is always so respectful, even with new faces. I always feel welcome and the food quality + packaging is excellent. This is truly some of the best service you’ll see in Fullerton, 10/10.

Amazing experience eating here, right as me and my bf walked through the door we were greeted by the whole staff with cheerful smiles, they had great music and comfy seats, the atmosphere is cozy and inviting beside it being so crowded in there but the food is absolutely delicious! Me and my bf had the spicy miso ramen and a California roll and it was amazing, so much flavors and food is fresh, We've gone to other ramen places and we always come back to this one. 10/10.

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KOPAN SUSHI & RAMEN REVIEWS

Recently, I’ve been loving this hidden gem of a restaurant! I really enjoy the cozy Japanese ambiance—it’s very comfortable. The staff is incredibly friendly and gave us great recommendations that turned out to be delightful surprises. I especially love the tonkotsu ramen; the broth is rich and flavorful, and even the kids enjoyed it. We also ordered the Ginza sushi—the sashimi was incredibly fresh, and the presentation was beautifully done. This is definitely a place I’ll keep coming back to.

The food was very delicious! I got the salmon bowl and hamburg steak. The salmon and roe was fresh and the steak was rich. The restaurant feels cozy and authentic. The service was a little slow but they made up for it with a discount. The tonkotsu ramen was also really good.

Been here twice in the same month! I loved their tonkotsu ramen and their deep fried volcano sushi roll. I decided to try the spicy one the second time, but it’s not spicy at all. My cousin got chicken and wontons, she said they were both as good as well. Their first time there and said they’d go back. Also, everyone makes you feel welcomed.

ROLL & GRILL REVIEWS

Grateful this small business eatery has been feeding the students from USCF and surrounding neighborhoods for years with fresh made grills and sushi with best deals in SoCal. All items are made fresh to order. Always line out the door. This is take out only joint and grill plates and sushi are the best deals. Those who want to complain about quality of service can wait outside. Highly recommend and Thank You for keeping the price down and continuing to feeding the college students with fresh made meals.

Roll & Grill has quickly become one of my favorite go-to spots! I usually order the hand rolls.the food tastes great and the quality is consistently high. Even though it can get packed at times, it’s worth it because the prices are so reasonable. Great atmosphere and definitely worth the visit.

Busy sushi, rice bowl restaurant. Good prices. Variety. Lunch specials all the time. Always busy still reasonable prices.

TBR® Inspection Score Report

WHAT'S UP JAPANESE NOODLES Total Inspection Points: 119/120
Reviews Accuracy of 4.4K: 9
Acknowledgments: 10
Business Hours: 10
Menu Images: 10
Complete Info: 10
Contact Info: 10
Exact Services: 10
Legitimate Ratings: 10
Location Proximity: 10
Online Order: 10
Pricing: 10
Extensive Menu: 10

TBR® Inspection Score Report

KOPAN SUSHI & RAMEN Total Inspection Points: 118/120
Reviews Accuracy of 5.3K: 9
Extensive Menu: 9
Acknowledgments: 10
Business Hours: 10
Menu Images: 10
Complete Info: 10
Contact Info: 10
Current Evaluation: 10
Exact Services: 10
Legitimate Ratings: 10
Location Proximity: 10
Pricing: 10

TBR® Inspection Score Report

ROLL & GRILL Total Inspection Points: 116/120
Contact Info: 9
Pricing: 9
Reviews Accuracy of 1.7K: 9
Extensive Menu: 9
Acknowledgments: 10
Business Hours: 10
Menu Images: 10
Complete Info: 10
Current Evaluation: 10
Exact Services: 10
Legitimate Ratings: 10
Location Proximity: 10