
Japan, like many other countries, has no shortage of “unique” inventions and products. Sometimes they may seem useless or downright impractical, but other times they’re just clever enough to be useful.
So where does this USB-powered onigiri (rice ball) warmer fall on the spectrum of clever and bewildering? We’ll let you decide for yourself!
Onigiri is a staple convenience store food in Japan–every store has them in as many varieties as can be packed on one or two shelves. Neatly packaged, the Japanese rice balls are less spherical and more triangular and generally come with a nori, seaweed, covering. Yank the cellophane wrapper off, and you’re ready to go to munch town!
▼”Yay! Munch town!”
However, some people prefer their onigiri warmed up instead of room temperature, and, fortunately, most convenience stores will warm your favorite rice ball for you at the counter. But if you work in an office, you may do your lunch shopping in the morning or bring it from home. Of course, if you’re feeling sensible, you could just pop your little rice triangle into a microwave for a few seconds, but sometimes microwaves just aren’t available. In that case, there’s little you can do besides sitting on your onigiri like a chicken hatching an egg.
▼”Butt-crack onigiri?! Noooo!”

Thankfully this new device will save you the indignity of having to eat body-temperature onigiri. Called simply “The Onigiri Warmer with USB (Brown)” on its product webpage, the device does just what its name says!
▼It even has two warmers! Talk about extravagance!
The warmer is in a triangle shape, perfect for your average convenience store onigiri, and can be plugged into whatever USB port you have available. Whether its your laptop, desktop, or tablet, it’ll only take 30 minutes for your rice ball to be nice and toasty.
▼We wouldn’t recommend sitting and staring at it the whole time though.
If you’re wondering how much this miracle device costs, it’s only a mere 1,280 yen (almost US$11). Pricey? Sure. Wonderfully weird to the point that it’s worth buying just to show to your friends? Definitely.
▼And look how happy she looks with her nice, warm onigiri!
Thanko, the company that made this unusual product, is apparently all about keeping things warm right now as it has a second USB-powered warming product available, this time for keeping your toes rather than your food toasty. And these “Comfy Slippers with USB” are only 2,680 yen (about $22.50)! As to why the onigiri warmer costs almost half as much as these slippers, we have no idea.
▼Yes, those are USB cables coming out of the slippers…
Now that we’ve helped you finish your winter-holiday present shopping for all the loved one in your life, why not relax with some giant rodents in hot water? It can’t be any less sanitary than butt-crack onigiri…
Sources/images: Thanko (Onigiri Warmer), Thanko (Comfy Slippers)
[ Read in Japanese ]







This USB device exists solely to warm up rice balls, and honestly, it does a great job
Should you warm up your convenience store onigiri rice balls in the microwave?【Taste test】
Onigiri without the nigiri – Japan’s traditional rice balls get an update
Great balls of octopus and rice! It’s the Takoyaki Onigiri
Survey ranks convenience store rice balls – salmon, sea-dwelling poultry & plants steal the show
Even at twice regular Daiso price, this handy item is still great for summer travel in Japan
Ghibli’s No Face continues to demonstrate his generous character growth by dispensing soy sauce
Osaka is hosting a “hentai” event, but it’s probably not what you think
Tokyo’s Pokémon Cafe reopens this month with brand-new sweets and Pikachu show
Japanese convenience store shows us how to dress for the rainy season
A Japanese toast sandwich remix: The toasted rice rice ball[SoraKitchen]
Starbucks Japan unveils new Frappuccino showcasing “mottainai” culture
Japanese high school closes its cafeteria, replaces it with a 7-Eleven convenience store
Lawson opens a new mini supermarket, and the lucky bags can essentially stock your kitchen
Uniqlo reveals third round of massive 100-year-anniversary manga T-shirts for Jump’s Shueisha
New official Ghibli anime food cookbook will teach you how to make Ponyo’s ramen and more
Kyoto public junior high school becomes first in Japan with a hoodie school uniform
What’s up with the Ghibli Park photo and video ban?
What’s it like to join Tokyo’s walking-and-talking-with-strangers club for a day?
Krispy Kreme releases a new Doughwich… at only one store in Japan
Tokyo’s life-size Gundam anime mecha statue will be removed this summer
Ichiraku Ramen-inspired ramen sets from Naruto anime pay homage to Naruto, Sasuke, and Sakura
Kanji ice cream becomes a sell-out hit in Japan
Japan now has gyoza doughnuts, and they taste like no other doughnut we’ve tried before
Japanese convenience store Lawson launches new “mini supermarket” chain, L Minimart
Japan’s real-world Pokémon hot spring’s first photos are here![Photos]
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
We deeply regret going into this tunnel on our walk in the mountains of Japan
Starbucks Japan releases new sakura goods and drinkware for cherry blossom season 2026
Japan’s newest Shinkansen has no seats…or passengers [Video]
Major Japanese hotel chain says reservations via overseas booking sites may not be valid
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]
Pokémon and Ikea Japan cross over into each other’s worlds with collaboration events
Beyond rice balls: How to make an edible onigiri rice cat【Video】
Rice balls aplenty at the Ministop senbero, but with a special twist【Japan’s Best Home Senbero】
The polite way to eat onigiri rice balls sparks debate online
Japan Railways recently revealed ramen-style rice balls in its convenience stores
The 10 best types of onigiri rice balls to try in Japan【Survey】
Bizarre or brilliant? Takoyaki and okonomiyaki rice balls available in convenience stores now
What are Japan’s best, and most unique, regional rice balls?
Drinkable rice balls appear in Japan, allow you to chug the country’s favorite snack on the go
Onigiri in Paris: Small lunch shop brings traditional Japanese rice balls to France
Tapioca onigiri brings boba to the world of rice balls
Pokémon Poké Ball rice balls are coming to 7-Eleven Japan!
Less than half of Japanese people OK with bare hand-pressed rice balls, survey says, but why?
Thanko lucky bag gives us gadgets we didn’t even know we needed
American rice ball restaurant takes liberties with classic Japanese snack
Japanese Twitter user creates terrifying ‘fluorescent’ rice balls
Cutest rice balls ever? Adorable new onigiri shop opening in downtown Tokyo【Photos】