
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
7-Eleven Japan’s ramen-cooking robot whipped us up a bowl of noodles【Taste test】
Cyberpunk anime meets traditional culture in Ghost in the Shell gold leaf Japanese changing screens
Hello Kitty Choco Egg figures are an adorable trip through three periods of Japanese pop culture【Pics】
Japan’s otoshidama tradition of giving kids money at New Year’s gets a social welfare upgrade
At what age should parents stop giving kids New Year’s otoshidama money? Japanese netizens answer
Sanrio brings some smiles to Evangelion with new collaboration merch line【Photos】
What happens if you make instant noodles with Coca-Cola instead of water?
Dragon Quest Burgers and Slime drinks are coming to McDonald’s Japan【Video】
Want the noodles without the noise? This is the perfect place for you to try wanko soba
We travel to Ormoc City, Philippines to talk to the victims of Typhoon Haiyan
Disillusionment at Tsukiji’s tourist-target prices led us to a great ramen restaurant in Tokyo
Japan may add Japanese language proficiency, lifestyle classes to permanent foreign resident requirements
Lacquerware supplier to emperor of Japan and Pokémon team up for new tableware
Starbucks Japan releases new zodiac chilled cup drink for 2026
7-Eleven Japan starts new temporary luggage storage service in over 300 branches
Starbucks on a Shinkansen bullet train platform: 6 tips for using the automated store in Japan
Large amount of supposed human organs left in Osaka marketplace
A Japanese dating app matched our bachelorette with a Buddhist monk, and she learned some things
Japan’s human washing machines will go on sale to general public, demos to be held in Tokyo
Japanese train company is letting fans buy its actual ticket gates for their homes
Starbucks teams up with 166-year-old Kyoto doll maker for Year of the Horse decorations【Photos】
Tokyo considering law requiring more trash cans following litter increase in heavily touristed area
Tokyo’s Tsukiji sushi neighborhood asks tour groups to stay away for the rest of the month
Nintendo’s Kirby now delivering orders at Kura Sushi restaurants, but not in Japan
Tokyo event lets you travel back in time, for free, to celebrate 100 years since Showa era start
Sanrio theme park in Japan announces plans to expand into a Sanrio resort
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
Japan’s deadliest food claims more victims, but why do people keep eating it for New Year’s?
We deeply regret going into this tunnel on our walk in the mountains of Japan
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
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】
The top 10 annoying foreign tourist behaviors on trains, as chosen by Japanese people【Survey】
No more using real katana for tourism activities, Japan’s National Police Agency says
Starbucks Japan reveals new sakura drinkware collection, inspired by evening cherry blossoms
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
Want onigiri? Just add water to Onisi Foods’ new rice balls!
Leave a Reply