
We try all five flavors of the “Hyakunigiri” Kyoto steak restaurant collaborative product to see if they’ll really rice up our lives.
We’ve all been there–those nights when you forget to press the “on” button of the rice cooker and find yourself some time later with a growling stomach and nothing to eat, not in the mood for instant noodles, and also don’t have the energy to step outside. In precisely these kinds of situations, Hyakunigiri is the perfect solution.
These intriguing onigiri, or rice balls, the result of a collaboration between Kyoto-based restaurant Hyakushokuya and food company Ishii Shohin, first hit the market a few years ago. The lineup has slightly expanded since then to five flavors, all of which are high in protein and can last 100 (“hyaku”) days at room temperature despite being additive-free, making them excellent choices for an emergency food rations kit.
▼ Hyakushokuya (logo pictured below) is a famous steak rice bowl restaurant that only sells 100 meals per day at lunchtime. It’s certainly an interesting business model, but one that’s working well for them.
There are five types of Hyakunigiri:
● Steak flavor
● Curry flavor
● Chahan (Chinese-style fried rice) flavor
● Chicken burdock rice flavor
● Chicken rice flavor
You can purchase a sampling set of all five flavors, with two pouches of each, for 2,600 yen (US$18). Otherwise, sets of five of each individual flavor cost 1,250 yen, apart from the steak flavor, which costs 1,500 yen for five.
The reason that Hyakunigiri can last so long without preservatives boils down to a combination of clever vacuum sealing and a heat sterilization technique. In order to eat them, you just have to pop them in the microwave or heat the pouch in boiling water until the rice reaches your desired level of firmness (suggested heating times range from 30 to 70 seconds in the microwave or 8 to 15 minutes in boiling water).
We wanted to start our taste test with the steak flavor since it’s modeled after Hyakushokuya’s famous restaurant menu item. As soon as we ripped open the pouch, we were immediately enveloped by a charcoal-like aroma.
Its flavor also packed a strong punch, with plenty of beef and seasoning in the rice. It tasted even more like a beef bowl than we expected, and was super satisfying as a whole.
Next up was the curry-flavored rice ball. This one also released a fragrance as soon as we opened the pouch.
It was chock-full of flavor. If we had to compare it with something, it had the taste and texture of a dry curry, sans gravy. It was also fairly spicy to the point that small children would probably have a hard time eating it. We figured that a slice of melted cheese on top of it would elevate its impact even more.
Moving along, it was time for the chahan (Chinese-style fried rice) flavor.
This one had the strong taste of black pepper, which would likely polarize some diners. That worked in our favor, though, and we quite enjoyed it as a fried rice with a peppery punch.
We actually decided to re-wrap this one in the shape of a regular onigiri and bring it to a local park to finish later. It served us well as a quick bite on-the-go–and dare we say it, was even tastier when eaten outside.
The second-to-last flavor we tried was chicken burdock rice. This is one of two Hyakunigiri marketed as having a “gentler” flavor.
The bits of chicken and burdock throughout served as yummy accents within the rice. It had a comforting, quintessentially Japanese-style taste. True to its name, it wasn’t overly strong, but it seemed to get tastier the more bites we took. It was perhaps our personal winner of the bunch.
For the fifth and final chicken rice flavor, we decided to heat it up in boiling water over a gas stove as we would likely have to do during a real emergency when there wouldn’t be any electricity. This was the other Hyakunigiri said to have a gentler taste.
This method resulted in a better heat distribution and a softer overall texture. We were a bit bummed out, actually–we should have heated all of them up in this way!
Oh well. In terms of taste, it was solid, and we were tempted to add some egg to the mix to turn it into omuraisu.
The final verdict is that all of these Hyakunigiri are pretty amazing. Usually emergency food rations sacrifice flavor for functionality, but in this case, they were delicious enough to want to eat on the regular. We’ll definitely keep some on hand for those days when we just don’t want to cook–or, when we attempt some new culinary creation in the name of investigative journalism that falls a bit flat.
Reference: Ishii Shohin
All images © SoraNews24
● Want to hear about SoraNews24’s latest articles as soon as they’re published? Follow us on Facebook and Twitter!
[ Read in Japanese ]














Rice balls that can last for 100 days at room temperature? Kyoto company makes high-protein onigiri
Space Onigiri: Do these long-lasting Japanese rice balls taste any good on planet Earth?
We try out “instant rice balls”, prepared with water, to see if they’re actually tasty
Drinkable rice balls appear in Japan, allow you to chug the country’s favorite snack on the go
Seven new rice ball flavors, including some Nissin collabs, coming to Family Mart this spring
A real-world Pokémon Poké Ball hotel is opening in Japan at a still-secret location [Video]
Tamagotchi evolves into a ring for its 30th anniversary, preorders now open
Japan’s most popular curry rice restaurant chain, Coco Ichibanya, might be for sale
Family Mart releases Famima convenience store products nationwide, but which ones are worth buying?
One Piece Day 2026 brings new art, music, and new cast announcements
Finally! Japan’s big three convenience store chains announce rice ball price reductions
Solo travel in Japan: Hidden beer garden in Tokyo is a haven for single visitors
Studio Ghibli unveils new anime calendars and diary planners for 2027
Onsen Egg Bukkake Udon Ice Cream makes us rethink everything we thought we knew about sweets
Hobonichi unveils new 2027 planners, diaries and stationery with One Piece, Suica Penguin, Hello Kitty and a must-buy Mini Techo
Japan’s final Penguin Suica train cards have already shipped, and when they’re gone, they’re gone
Japan approves foreign resident visa renewal fee increases of up to 967 percent, starts soon
Japan tripled its departure tax to fund tourism but is using the money on cherry blossoms and bears
Farewell Final Ceremony announced for Tokyo’s life-size Gundam statue, will stream live
Family Mart releases new Human Made Cup Noodle in Japan, with freebies for Nigo fans
Hikaru Utada sings new song in Shinkansen commercial for Japan’s Supreme Class cabins
Nike x One Piece collection brings Devil Fruits to sneakers and streetwear in Japan
12-year-old British girl who went missing in Tokyo found safe after visiting anime sites around Yokohama
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
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
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
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】
Japanese convenience store’s newest rice ball filling: Nothing at all, and why we’re OK with that
Should you warm up your convenience store onigiri rice balls in the microwave?【Taste test】
Say hello to the Big Bomb Onigiri, a beast of a Japanese rice ball
Onikun: Epic onigiri so big they’re half demon, half rice ball
Coffee-infused rice for rice balls and curry? Taste-testing a recipe from Japan’s coffee experts
Pokémon Poké Ball rice balls now on sale in Japan, don’t taste like jelly donuts【Taste test】
Japanese convenience store packs a whole bento into an onigiri rice ball
Convenience store onigiri rice balls become even more expensive…but are they worth it?
Will frozen bento onigiri be Japan’s next big convenience store food trend?【Taste test】
We learn the dark secret of Japan’s Woodstock rice balls, still want to eat them【Taste test】
Japanese convenience store brings rice balls back to 100 yen – Is this deal worth it?[Taste test]
Who makes Japan’s best Spam-style onigiri convenience store rice ball? Let’s find out【Taste test】
7-Eleven Japan now has two tiers of salmon rice balls, but is the new, cheaper one any good?【Taste test】
This Tokyo rice ball takes 20 years to make and 2,000 yen (US$14.30) to buy, but is it worth it?
Top Japanese instant noodle maker steps up its rice ball game 【Taste test】
Rice ball melon bread – A treat Japanese bakeries aren’t crazy enough to make, but we are【SoraKitchen】