
You may have thought that the Loch Ness Monster had cornered the market on fresh-water cryptids, but Japan has one of its own mythical lake beasts. There may be a monster lurking in the depths of Kyushu’s Lake Ikeda, a monster who goes by the terrifying name of… Issie-kun.
Lake Ikeda, at just 15 km around and with a maximum depth of 233 meters, is still the largest lake in Kyushu, which just goes to show that there are not that many lakes in Kyushu. It’s a caldera lake, meaning it doesn’t connect to the ocean and depends mostly on precipitation to maintain water levels.
The lake is supposedly also the home of a huge saurian creature called Issie, or Issie-kun, to give him the diminutive male suffix the city seems to prefer. Issie was first spotted by a family in 1978. Twenty witnesses reported seeing some black humps several meters in length moving through the water. Later that same year, a man named Toshiaki Matsuhara caught the creature on film.
▼ It’s Issie! …or some glare on the water. Or maybe some lake weeds? Whatever. Proof!
Since then, the tourism authorities have been promoting the Issie story to attract visitors to the region. There is even a mythology to explain Issie’s creation. In the story, a white mare lived on the shores of the lake with her foal. When the foal was captured by samurai, the white mare leapt into the lake in despair, transforming into a huge water creature. She surfaces now and then to look for her child. There is no explanation as to why Issie is a female in the story, but the monster is generally considered male. Another mystery!
On a completely unrelated note, Lake Ikeda is home to giant eels, some of the largest in the world. They can grow to several meters in length. I’m sure the resemblance to Issie is purely coincidental.
▼Issie looms over a roadside gift shop.
▼ Inside, you can see some captive eels, though none are over a meter.
▼ Even if he knows where Issie is, he ain’t talking.
▼ Some decidedly cuter versions of Issie to dangle from your phone.
▼Or maybe some Issie ice cream?
▼ This kindly Issie watches over the public restroom.
▼This playground looks awfully familiar…
▼ On top, there’s a view point with the three locations of reported Issie sightings marked.
▼ Several identical Issie statues line the shore for photo ops.
▼ Lake Ikeda. What mysteries lie beneath your waves?
If you happen to have any photographic evidence that Issie-kun exists, be sure to drop us a line.
Photos: RocketNews24, La Cite Perdue (Matsuhara photo)












W.T.F. Japan: Top 5 creepiest Japanese animals 【Weird Top Five】
Salomon releases Japan-exclusive Mt. Fuji hiking gear that doubles as an amazing souvenir
Japan triples departure tax, foreign tourists and locals now must pay more to leave country
Japanese overnight sightseeing train returns for summer with ramen stops and ocean views
Sanrio Character Poll announces winners, Hello Kitty absent from top 10 in many countries
Starbucks Japan teams up with Converse Tokyo for a new limited-edition collection in honour of Tanabata
7-Eleven Japan has a lot of famous food, but its new burrito needs to be on your radar
Japan’s Mocchurin donuts declared too popular to exist by creator Mister Donut, will disappear soon
Japan’s new pettably fuzzy cat-shaped earbud chargers meow to let you know their status[Video]
Sanrio collaborates with Sesame Street for adorable merch and sweets in Japan[Photos]
Family Mart Japan installs red-eyed “Monster Wolf” to keep bears away from convenience store
Live-action Spirited Away stage play announces world tour with first-ever U.S. and Canadian dates
Starbucks Japan reopens Shinkansen platform store after redesigning it for speed
Pikachu brings electric style to brand-new Pokémon G-Shock watch featuring every stater trio
Tokyo has only two barley tea makers, and we visited one to see how mugicha is made
Blind Tokyo commuter explains the easiest place for him to stand while riding the train
Japan launches first overnight Shinkansen bullet train between Tokyo and Osaka this summer
Japanese man’s gross conveyor belt sushi social media prank video gets him a 500,000-yen fine
Sleep at Hoshinoya Nara Prison, one of the most unique hotels in Japan
Japan announces sudden 400-percent increase in visa fees for foreigners entering the country
Japanese ninja certification exam attracts 131 candidates from Japan and abroad
Studio Ghibli store Donguri Republic announces opening of first-ever store in America
New Japanese overnight train coming to connect Tokyo with Tohoku in sleep-travel style
Even at twice regular Daiso price, this handy item is still great for summer travel in Japan
Japanese sweets shop sells an ohagi so exquisite it sells out by noon
Forget Tokyo go-karts – there’s a new way to sightsee on four wheels in Japan
Japanese sweets brand creates new drinkable Cigare and we’re totally here for it
Uniqlo reveals third round of massive 100-year-anniversary manga T-shirts for Jump’s Shueisha
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]
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]