
If you can’t beat ’em, wear ’em.
Aside from the energy-sapping heat of summer in Japan, the season also brings with it swarms of insects. There’s nothing worse than sweating buckets outside, only to hear that ultra-high-pitched whir of a mosquito graze your ear. Blindly waving your hands and hurling epithets at it is useless because there’s only one language bugs understand: eat or be eaten.
That’s why our writer Udonko invested in Oniyanma-kun, a plastic figure of an oniyanma dragonfly. “Yanma” is the Japanese word for larger types of dragonfly and an “oni” is a type of mythical demon that’s similar to an ogre, but the word is often used figuratively to mean something like “mother of all” in a superlative sense. So, “oniyanma” can literally translate to “the mother of all dragonflies” and is also known as the “jumbo dragonfly” in English. Needless to say, they can be pretty big — up to 10 centimeters (4 inches) in fact — and they get that way by being a voracious devourer of other insects.
Udonko figured that such a notorious predator in the insect world stood a good chance of keeping bugs off her and her beloved dog, so she ordered one online for 964 yen plus 460 yen for shipping and paid a total of 1,424 yen (US$10).
Oniyanma-kun is about the size of a real oniyanma, which is to say really big, and it has a safety pin on the mouth so you can attach it to clothing or bags.
According to the package, it’s most effective when placed somewhere that other insects can easily see it, like on a hat or backpack.
The package also said it would work for dogs as well, so she decided to pin Oniyanma-kun to her pet’s harness and go for a walk in an area where bugs are known to be. This way she could clearly monitor how well it worked.
She repeated this for about two weeks to get a good sense of Oniyanma-kun’s effectiveness and came to the conclusion that it kind of worked sometimes. She could clearly see that wasps and mosquitoes that would normally beeline it for her dog veered away when Oniyanma-kun was spotted.
However, really small bugs like gnats did not seem deterred by the plastic dragonfly. Perhaps they lacked the ability to detect it well, but either way, that was acceptable since it was more the wasps and mosquitos that Udonko was worried about.
Another problem was that when a mosquito was out of the line of sight with Oniyanma-kun it didn’t hesitate to bite into her prized pooch, either because it was smart enough to get out of the dragonfly’s field of view or because it was stupid enough to not even remember the beast was there once it was out of sight.
One really good point about Oniyanma-kun was that it worked across a range of insect species, whereas bug repellants often only target certain ones. Although it definitely had its limitations, there was a certain degree of effectiveness and if used in the right way or in combination with other methods, it could be a useful tool.
It also gave Udonko an added sense of confidence. When a wasp approached her, she would say, “Are you sure about that? I got an oniyanma here,” and she could stay calm until it flew away. All in all, the positives outweighed the negatives and it was well worth the purchase both for her and her dog.
Related: Amazon Japan/Oniyanma-kun
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 ]









What’s up with the “mosquito buzz” noise at Shibuya Station?
7-Eleven Japan’s cooked-in-store takoyaki is here! How does it fare against the street food king?
New Kyoto Converse sneakers celebrate Japan with traditional kimono fabrics for your feet
Burger King Japan launches King Fusion, and the possibilities are endless (and delicious)
Japanese convenience store brings rice balls back to 100 yen – Is this deal worth it?[Taste test]
What’s up with the “mosquito buzz” noise at Shibuya Station?
7-Eleven Japan’s cooked-in-store takoyaki is here! How does it fare against the street food king?
New Kyoto Converse sneakers celebrate Japan with traditional kimono fabrics for your feet
Burger King Japan launches King Fusion, and the possibilities are endless (and delicious)
Japanese convenience store brings rice balls back to 100 yen – Is this deal worth it?[Taste test]
Studio Ghibli adds new anime character puppet socks to its merchandise store in Japan
Tsujihan sushi bowl restaurant goes viral with foreign tourists, but is it worth the hype?
Hello Kitty is now a transforming truck robot[Photos]
Immerse yourself in TeamLab Yoro Valley’s outdoor nighttime art exhibition in Chiba’s wilderness
Kyoto curry bread comes with a very special filling
Japan’s 5.3 million beautiful Hitachi Nemophila flowers are now in full bloom[Photos]
Studio Ghibli launches huge new anime movie T-shirt collection with special design details
Japan’s awesomely beautiful Alpen Route snow corridor is now open
Tifa’s Final Fantasy VII bar is going to pop up in real-world Tokyo
Brand-new Pokémon manhole covers coming to help the recovery of a disaster-stricken part of Japan
Studio Ghibli croquettes not to eat, but to keep your stuff in, going on sale in Japan[Photos]
Pokémon hot spring footbath opening in Japan this spring
Secret staff cafeteria in Tokyo is a hidden gem you won’t find in travel guides
Move aside, convenience store egg sando – there’s a better version of the iconic sandwich in Japan
Japan reportedly adding Japanese language skill requirement to most common foreigner work visa
Pokémon and Ikea Japan cross over into each other’s worlds with collaboration events
Wisteria season starts early with blooming of Japan’s Great Wisteria in its beautiful garden
Japan now has a special desk for people who work at home with a pet cat[Photos]
Japan’s best conveyor belt sushi restaurant of seven years ago has now, finally, come to Tokyo
Famous Tokyo cherry blossom spot installs view-blocking screens to fight overcrowding[Video]
Survey asks foreign tourists what bothered them in Japan, more than half gave same answer
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
Studio Ghibli releases Kodama forest spirits from Princess Mononoke to light up your home
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】
No more using real katana for tourism activities, Japan’s National Police Agency says
Studio Ghibli adds new anime character puppet socks to its merchandise store in Japan
Tsujihan sushi bowl restaurant goes viral with foreign tourists, but is it worth the hype?
Hello Kitty is now a transforming truck robot[Photos]
Immerse yourself in TeamLab Yoro Valley’s outdoor nighttime art exhibition in Chiba’s wilderness
Kyoto curry bread comes with a very special filling
Wisteria season starts early with blooming of Japan’s Great Wisteria in its beautiful garden
After eight years as a NEET, our reporter shares the one thing that helped him escape that life
Studio Ghibli announces first new short anime film in 8 years, exclusive to Ghibli Park
Japanese convenience store gives away free ice cream with creative ad at Shinjuku Station
Tifa’s Final Fantasy VII bar is going to pop up in real-world Tokyo
Real takoyaki is almost impossible to find in Tokyo, but this place has it, our hardliner says
7-Eleven Japan releases Uji matcha smoothies… but only at select locations
Travel off the beaten path to a secret spot in Japan where bamboo grows wild on an old train line