
Our search in natto mecca Mito leads us to Kogoira Natto.
Just about every part of Japan has a food it’s famous for, and in Mito, the capital city of Ibaraki Prefecture, that food is natto, a.k.a. fermented soybeans, a.k.a. Japan’s smelliest food. But if Mito is the best place for natto, then by extension the best natto in Mito should be the very best in all of Japan, right?
That was the logic our Japanese-language reporter Ikuna Kamezawa was following when she asked her friend, a Mito resident, to recommend the best natto you can buy in the city.
Ikuna popped this question while she and her friend were at a Mito supermarket, standing in front of the giant natto shelf. Even with that wide selection, though, Ikuna’s friend said the best natto wasn’t here, so the two of them headed to the Mito branch of the Keisei Department Store…
…and over to the kensanhin (県産品), or Ibaraki-produced items, area on the store’s food floor, where Ikuna’s friend pointed her to the Kogoira Natto from maker Marushin Shokuhin.
This, her friend said, is the best of the best…but Ikuna had never heard the word “kogoira” before. It turns out that it’s a variant of soboro natto, which is itself a variant of regular natto. In soboro natto, the fermented soybeans are mixed with minced daikon radish, and if you throw in the radish’s leaves too, then it becomes Kogoira Natto.
▼ Kogoira Natto
▼ Regular natto (left) and Kogoira Natto
Despite Ikuna’s friend’s glowing endorsement, Kogoira Natto is priced at just 324 yen (US$2.30), and Ikuna decided to pick up three different types of it.
▼ Clockwise from top left: Kimchi Kogoira Natto, Plum Sea Grass Kogoira Natto, and regular Kogoira Natto
▼ The different flavors come from included sauces that you stir into the fermented soybeans right before eating.
Natto is sold refrigerated, so Ikuna asked for plenty of ice packs for her trip back to Tokyo to share her natto bounty with the rest of the SoraNews24 HQ staff.
She decided to start the sampling by giving fellow writer P.K. Sanjun a taste. However, P.K., who has a deep hatred of natto thanks in no small part to its extremely pungent, sock-like odor, turned her away immediately.
▼ Yes, even among people born and raised in Japan, natto’s smell can be a deal breaker.
Next, she approached Japanese editor Go Hatori, who has no olfactory hangups when it comes to natto.
So what did Go, who’s a natto fan in general, think?
“Hey, this is good stuff! It’s…interesting. Oh, is this daikon radish? That’s unique! Even more than a deliciously interesting natto, I’d call this an interestingly delicious natto!”
Also down for a taste was Jun, another member of our Japanese-language writing staff and a natto lover, who said of the Kogoira Natto “This is the best-tasting natto I’ve ever eaten.”
So while people who can’t handle the smell of natto probably won’t be able to come near enough to Kogoira Natto to taste it for themselves, if you’re someone who doesn’t mind natto’s aroma, you’ll probably love the taste of this natto, and if you can’t make the trip to Mito, it’s available online from Marushin Shokuhin here.
Related: Keisei Department Store (Mito branch)
Photos ©SoraNews24
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!
[ Read in Japanese ]












We spice up our fermented soybeans with curry powder flavored natto【Taste Test】
Pork Cutlets with Fermented Soybeans? All-You-Can-Eat Natto Part 2!
Could this be the secret to get Americans to actually like natto (Japanese fermented soy beans)?
Natto for beginners? How to half-make Japanese fermented soybeans at home【SoraKitchen】
We head out to Kyoto to eat a delicious crepe crammed with fermented soybeans, rice【Taste Test】
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
Japanese airport rebrands itself as “Sushi Airport” to attract foreign tourists
Japan reacts to Donald Trump’s “Islamic Republic of Japan” remark
Tochigi man shares his family’s process for creating 16 years worth of rice paddy art
Starbucks Japan puts a bow on peach season with new limited-edition Peach Creamy Tea Latte
Tokyo revises accommodation tax amidst tourism boom, Airbnb rentals now included
Potato-Chip-Flavored Dressing coming to stores in Japan
Studio Ghibli theme park’s new dessert is a drinkable version of Hayao Miyazaki’s pilot daydream
Yoshinoya and Dragon Quest slaying scalpers with shift to made-to-order collaboration merch
Climbing season officially opens for Japan’s Mt. Hiyoriyama, the shortest mountain in the country
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Japan triples departure tax, foreign tourists and locals now must pay more to leave country
A visit to Sri Lanka’s knockoff knockoff Uniqlo (no, we didn’t stutter) to see its rare “Pikachus”
New Mt. Fuji overnight bus takes travelers from downtown Tokyo straight to the most popular hiking trail
Starbucks Japan teams up with Converse Tokyo for a new limited-edition collection in honour of Tanabata
Don’t judge this Kiki’s Delivery Service book by its cover, because it’s not actually a book!
7-Eleven Japan releases chocolate cookies that taste like freshly baked melon bread
Japanese overnight sightseeing train returns for summer with ramen stops and ocean views
7-Eleven Japan now has Vietnamese banh mi sandwiches, but how do they taste?[Taste test]
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Studio Ghibli store Donguri Republic announces opening of first-ever store in America
New Japanese overnight train coming to connect Tokyo with Tohoku in sleep-travel style
Japan launches first overnight Shinkansen bullet train between Tokyo and Osaka this summer
Japanese sweets shop sells an ohagi so exquisite it sells out by noon
Forget Tokyo go-karts – there’s a new way to sightsee on four wheels in Japan
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Starbucks Japan releases new drinkware and goods for Valentine’s Day
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
The surprising reason natto (fermented soybeans) are hard to swallow for many Japanese surfers
All-You-Can-Eat Fermented Soybeans for $8.50! Choose From Eight Types of Natto!
Our resident natto lover tries Mythical Natto from Hokkaido and gets spirited away【Taste test】
The most expensive natto in Japan – Eating the “black diamonds” of Tanba Kuro【Taste test】
How many times should you mix natto to make it more delicious?
Nattoku! Factory offers free factory tours of a famous natto brand production process
Japan’s first made-to-order natto store will make you fermented beans without the putrid smell
Our natto maniac verifies the legitimacy of fermented soybean-flavored potato chips【Taste test】
We try ice cream with a topping of natto fermented soybeans, because the Internet told us to
There’s no reason not to play with your food with this natto in Nanoblock form
We try a new natto coffee ice cream that took 17 months to perfect
Gross out your natto-hating friends with this incredibly realistic, sticky-looking train pass case
Natto-infused ramen is a thing — we tried it, we love it【Taste test】
Instant natto soba a suspiciously hot item so we check it out
Japanese bento serves up a slice of the samurai life in a special carry case
That time we were either genius or insane to eat natto with Yukimi Daifuku per official advice