
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】
Nike x One Piece collection brings Devil Fruits to sneakers and streetwear in Japan
Nephew of Studio Ghibli director Hayao Miyazaki serves up Totoro Shaved Ice in Tokyo
Nagoya’s famous Shinkansen platform noodle shop has other, better branches nearby
Winnie the Pooh cosplays as Yuzuru Hanyu for new plushie collaboration
Osaka Starbucks has one of the city’s coolest photo vantage points, but it’s going away soon
Japan’s double-decker portable rice cooker/bento maker is better than ever with new version
We recommend not buying one pack of Japan’s new convenience store corn soup-flavor fried chicken
Data suggests increased bear sightings have led to a decrease in mountain climbers across Japan
Narita Airport Transit & Stay Program returns after six years with free tours and festival experiences
Ohaw? Ruibe? Pocche? While traveling in Japan’s north, we try Ainu cuisine for the first time
7-year-old boy left behind on Mt. Fuji by his own dad
Sushi Bus: Japan’s first conveyor-belt bus lets you eat sushi while sightseeing around Tokyo
12-year-old British girl who went missing in Tokyo found safe after visiting anime sites around Yokohama
Studio Ghibli unveils new interactive stationery dioramas that bring anime movies to life on your desk
Studio Ghibli composer Jo Hisaishi just set three Guinness Records
Anime fans can now wear a Seiko watch inspired by Japan’s One Piece Shinkansen
7-Eleven Japan brings back best-selling flat croissant that became a hit on social media
Foreign hiker on Mt. Fuji loses consciousness and dies, becoming climbing season’s second fatality
Universal Studios Japan partners with manga horror master Junji Ito’s Tomie
Japanese workers reveal their top five mysterious rules they wish would disappear【Survey】
Air-conditioned dress shirts arrive in Japan to save working professionals from sweltering heat
Pokémon Center Online designates first Pokémon items that will require Japanese ID card to buy
Japanese toilet aims to attract foreign tourists but not everybody is happy about it
Tokyo’s newest viral dessert is like a Japanese parfait inside a bread bun [Taste test]
New Japanese vending machine at Shinkansen station sells cups of ice on platform
Study finds hundreds of people in Indonesia legally named after Naruto, Inuyasha, other anime stars
Japanese vending machine sells freshly squeezed lemon juice with a futuristic light show
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Studio Ghibli has a new anime out, and there’s only one place in the world where you can see it
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]
Tokyo subway installing new ticket gates that don’t accept payment through Suica or other IC cards
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Put sesame oil in your coffee? Japanese maker says it’s the best way to start your day【Taste test】
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
Waiter, there’re 100 crickets in my soup! We try make-it-yourself Cricket Ramen【Taste Test】