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BLUEFIN TUNA BELLY TORO - Koisan Sushi, Orange, CA

Koisan Sushi

4.3
4.3
36 Reviews
$31 to $50
Sushi

Make a reservation

2 people
7:00 PM
Booked 1 time today
  • Neighborhood gem
  • Great for happy hour
  • Kid-friendly
Koisan Sushi is a Japanese restaurant that has offered creative, fresh, and authentic Japanese cuisine at the heart of orange for 40 years. Illuminated by Japanese style lanterns and the walls adorned with specialized craftsman woodwork, Koisan is a time machine to ancient Japan.

Koisan's dining experience can be approached one of two ways. Diners can request the dining room where the kitchen menus such as the Seafood Tokyo Udon Pasta, or the or Miso Black Cod Entrees are available; or request the sushi bar to order sushi and sashimi such as Toro (Bluefin Tuna Belly) or Tai (Sea Bream) a la carte with the help of our skilled chef Ken. The sushi bar is a coveted place for many regular customers, where beginners and pros are welcome alike. Koisan also offers a large selection of alcoholic beverages, specializing in Japanese Beer and Imported Sake - offered during Orange's best Happy Hour. Now offering $45 Omakase!

Note*: Sushi Bar seating does not grant access to Kitchen Entrees.

Order delivery or takeout

Additional information

  • Dining style
    Casual Dining
  • Price
    $31 to $50
  • Cuisines
    Sushi, Asian, Japanese Speciality
  • Hours of operation
    Mon–Fri 11:30 am–9:30 pm Sat 12:00 pm–9:30 pm Sun 3:00 pm–9:30 pm
  • Phone number
    (714) 639-2330
  • Payment options
    AMEX, Discover, Mastercard, Visa
  • Dress code
    Casual Dress
  • Executive chef
    Ken
  • Catering
    We do not offer catering services, but can arrange our sushi orders on a party platter upon request! We welcome big orders! Please call to scheduling a catering order.
  • Private party facilities
    We have the party room available for booking, for parties up to 24 people! Larger reservations confirmed through our online system may take time to update. Please call to confirm availability if you have a big party for us to accommodate. Thank you for choosing Koisan Sushi Bar!
  • Neighborhood
    Orange
  • Cross street
    Largest Intersection: Katella Ave. & Tustin Ave./California
  • Parking details
    Private Lot
  • Additional
    Bar/Lounge, Beer, Chef's Table, Corkage Fee, Counter Seating, Delivery, Happy Hour, Late Night, Non-Smoking, Patio/Outdoor Dining, Private Room, Takeout, Vegan, Wheelchair Access, Wine

Offers

  • Orange's Best Happy Hour

    Multiple dates available
    Sun - 3:00 PM - 8:30 PM,Fri - Sat - 3:00 PM - 8:30 PM
    As Koisan Sushi Bar reaches it's 40th anniversary, we are proud to announce our revamped happy hour. Hot Sake (L) - BUY ONE GET ONE FOR 1C! Select Japanese Beers (L) - 50% OFF! ALL Bottles Sake - BOGO 50% OFF! ALL SPECIALTY ROLLS ARE BUY ONE GET ONE 50% OFF! Select Appetizers - Up to 50% OFF! Select Sushi & Rolls - Up to 50% OFF! NOW OFFERING OYSTER SPECIALS ON HAPPY HOUR!

    Orange's Best Happy Hour Photo

What 36 people are saying

Overall ratings and reviews

Reviews can only be made by diners who have eaten at this restaurant

4.3
4.3 based on all time ratings
  • 4.5Food
  • 4.3Service
  • 4.2Ambience
  • 4.3Value

NoiseModerate

36 Reviews
  1. Carlos

    San Francisco

    6 reviews

    vip
    5.0

    6 reviews

    Dined on October 6, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Food quality was great and the place was really cozy.

    Is this helpful?

  2. Don

    Orange County

    23 reviews

    vip
    5.0

    23 reviews

    Dined on August 18, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    This is probably the best Japanese food in Orange county. If you have not been here I would recommend giving it a try.

    1 person found this helpful

  3. RodilS

    Palm Springs

    2 reviews

    4.0

    2 reviews

    Dined on June 28, 2024

    1. Overall 4
    2. Food 4
    3. Service 4
    4. Ambience 5
    Oysters were good but pricey, sashimi cuts were small but they will offer you a better cut for more $$$. Place was nice and quiet, waiter was a little weird refuse to let us seat when're we want even though there wasn’t a lot of people.

    1 person found this helpful

  4. OpenTable Diner

    Orange County

    3 reviews

    5.0

    3 reviews

    Dined on June 20, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Pleasantly surprised about this resturant. We are picky Sushi eaters and steer clear of any establishments serving subpar sushi. Our normal joint has now closed down so we were hunting around for some quality sushi places and came across Koisan; and I am nonetheless very impressed with the quality and how well rounded the palettes behind their sushi are. First, the decor is aesthetically pleasing. It is definitely a bit dated but feels cozy and authentically Japanese. Secondly, the staff are very well educated on what they are serving, and where the fish are from. The servers and chefs had great recommendations on sake pairing and what fishes are fresh the day of. Most importantly, their sauces are really something else. The secret sauce, and their ponzu feels new yet so familiar. I also tried some rolls with Sashimi and Nigiri, and they were very flavorful but not overpowering like some sushi places that drizzle eel sauce on everything. If you are looking for a cozy, relaxed, but also a detailed sushi experience, come to Koisan. It has my seal of approval.
    Koisan SushiResponded on June 20, 2024
    It was our uttermost pleasure serving you at the bar. We are very pleased that you found your new sushi spot! We hope to serve you again soon. Thank you for your patronage.

    1 person found this helpful

  5. OpenTable Diner

    Orange County

    1 review

    5.0

    1 review

    Dined on June 11, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    We came here for graduation celebrations. We had more people than our reservation count but the staff accommodated us quickly and we really appreciated that. We ordered a variety of rolls and kitchen items and everybody was really happy with what they got! Staff was friendly, menu has a little something for everyone, and service was quick and attentive. Great for groups, families, and date nights alike. We highly recommend this place. :)
    Koisan SushiResponded on June 20, 2024
    Congratulations! We are glad that you enjoyed our restaurant. We look forward to serving you again in the near future. Thank you for choosing Koisan Sushi Bar.

    1 person found this helpful

  6. OpenTable Diner

    Orange County

    3 reviews

    5.0

    3 reviews

    Dined on June 10, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Amazing experience! Food was so good, and staff was friendly! It was our first time here, we were blown AWAY. I’ve been a OC local but was pleasantly surprised that they were in business since 1982 and never heard about this place! Get the $45 Omakase to start. Staff and chefs heavily recommend their Bonta which was exquisite. The fish literally melted in your mouth and was so buttery with no fishy aftertaste. I was really impressed with the quality at this price point. The resturant is well decorated and kept clean, and the menu is PACKED with options. I am still thinking about their yellowtail carpaccio. We will be back!
    Koisan SushiResponded on June 20, 2024
    Hello. We are glad that you enjoyed our restaurant. We look forward to serving you again in the near future. Thank you for choosing Koisan Sushi Bar.

    1 person found this helpful

  7. BonnieS

    Orange County

    13 reviews

    vip
    5.0

    13 reviews

    Dined on April 11, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 4
    We frequently dine at Koisan! The food and presentation is fabulous! You can taste the quality of sushi in each bite. The staff is friendly, professional, and always greet you with a smile! Marissa and Ryan are the BEST!! ❤️

    1 person found this helpful

  8. GregA

    Nashville

    9 reviews

    vip
    2.0

    9 reviews

    Dined on March 15, 2024

    1. Overall 2
    2. Food 5
    3. Service 1
    4. Ambience 3
    Reservation on a Thursday was at 7pm. Didn’t get sat until 745. Or water and one beer didn’t come out until 810. Dinner didn’t come until after 9. 2 rolls were missing and didn’t arrive for another 30 min. There were only 20 people in the restaurant. Not sure where the break down was. Luckily the rolls were great

    Is this helpful?

  9. BonnieS

    Orange County

    13 reviews

    vip
    3.0

    13 reviews

    Dined on February 15, 2024

    1. Overall 3
    2. Food 4
    3. Service 2
    4. Ambience 3
    Visited this restaurant on Valentine’s Day with my open table reservation. We waited 20 minutes to be seated. It seems to be that all the take out orders took precedence over customers already seated waiting for drinks and food. I looked across to another table and could tell they had been waiting quite sometime for a server to return to their table. We had plans after dinner so this out us in a rush situation. Ryan and Marissa were working their butts off but management needs to staff better in the future.
    Koisan SushiResponded on February 23, 2024
    Hi Bonnie. I'm terribly sorry about the delays that we have incurred you; especially on your Valentines! Your time and your experience that you have at our restaurant is very important to us. We are aware of staffing inconsistencies and how service staff was overwhelmed on Valentines 24'. We are in the steps of making appropriate operational changes to make service smoother during high traffic situations. I hope you had a great V-day, please take care and thank you for your patronage!

    Is this helpful?

  10. Iker01

    Mexico City

    17 reviews

    vip
    5.0

    17 reviews

    Dined on January 28, 2024

    1. Overall 5
    2. Food 5
    3. Service 5
    4. Ambience 5
    Excelente calidad de Sushi en Anaheim!!! Buena atención, lugar acogedor. Excelente valor por el precio!

    Is this helpful?

FAQs

Koisan Sushi offers takeout which you can order by calling the restaurant at (714) 639-2330.

Koisan Sushi is rated 4.3 stars by 36 OpenTable diners.

Yes, you can generally book this restaurant by choosing the date, time and party size on OpenTable.

Make a reservation

2 people
7:00 PM
Booked 1 time today

Order delivery or takeout

Google Map for Koisan Sushi

1132 E Katella Ave, Orange, CA 92867

Additional information

  • Cross street
    Largest Intersection: Katella Ave. & Tustin Ave./California
  • Neighborhood
    Orange
  • Hours of operation
    Mon–Fri 11:30 am–9:30 pm Sat 12:00 pm–9:30 pm Sun 3:00 pm–9:30 pm
  • Price
    $31 to $50
  • Cuisines
    Sushi, Asian, Japanese Speciality
  • Dining style
    Casual Dining
  • Dress code
    Casual Dress
  • Parking details
    Private Lot
  • Payment options
    AMEX, Discover, Mastercard, Visa
  • Executive chef
    Ken
  • Additional
    Bar/Lounge, Beer, Chef's Table, Corkage Fee, Counter Seating, Delivery, Happy Hour, Late Night, Non-Smoking, Patio/Outdoor Dining, Private Room, Takeout, Vegan, Wheelchair Access, Wine
  • Phone number
    (714) 639-2330
  • Catering
    We do not offer catering services, but can arrange our sushi orders on a party platter upon request! We welcome big orders! Please call to scheduling a catering order.
  • Private party facilities
    We have the party room available for booking, for parties up to 24 people! Larger reservations confirmed through our online system may take time to update. Please call to confirm availability if you have a big party for us to accommodate. Thank you for choosing Koisan Sushi Bar!
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