Doyo no Ushi no Hi 2026: Why Tokyo Eats Eel on July 26 — and Where to Try It Near Ueno

Next Sunday, something quietly wonderful happens across Japan: everyone eats eel. Doyo no Ushi no Hi (土用の丑の日) — the midsummer "Day of the Ox" — falls on Sunday, July 26, 2026, and on that day eel restaurants sell out, supermarkets pile up glossy kabayaki, and the smell of caramelizing soy-mirin sauce drifts through every shopping street. If you're staying in Tokyo this July, this is one of the easiest and most delicious Japanese customs to join. Here's the story behind it, and where to eat unagi like a local near Yushima.

What is Doyo no Ushi no Hi?

Doyo refers to the roughly 18 days before each seasonal turning point in the old calendar — the summer doyo being the stretch before risshu, the traditional start of autumn. Days were once counted in the twelve zodiac signs, so within each doyo period there are one or two "Days of the Ox" (ushi no hi). The midsummer one lands in the hottest, most draining weeks of the year — exactly when, as the thinking goes, you need serious stamina food.

And for over a millennium, Japan's stamina food of choice has been eel. The 8th-century poetry anthology Manyoshu contains a teasing poem urging a skinny friend to catch and eat eel for his summer weight loss. Rich in vitamins A and B, unagi earned its reputation as the cure for natsubate — summer fatigue.

The best marketing story in food history

Why eel specifically on the Day of the Ox? The most beloved explanation stars Hiraga Gennai, the Edo period's great inventor and polymath. Sometime in the 18th century, a struggling eel-shop owner asked Gennai for advice — summer was slow season, since heavy grilled eel felt like winter food. Gennai told him to hang a sign reading simply: "Today is Doyo no Ushi no Hi." Curious customers streamed in, rival shops copied the sign, and 250 years later the whole country still eats eel on cue. It may be Japan's oldest successful advertising campaign.

There's a folk-logic layer too: it was said to be auspicious to eat foods starting with "u" on ushi day — so if eel (unagi) isn't your thing, tradition also approves of umeboshi (pickled plum), udon, and uri (melon and gourds). All light, restorative summer foods.

How Tokyo does eel: Edomae kabayaki

Tokyo's eel style is its own art form. In Edomae kabayaki, the eel is split along the back (cutting the belly was considered bad luck in samurai Edo — too close to ritual suicide), skewered, grilled once, then steamed until pillowy soft, then dipped in a tare of soy sauce and mirin and grilled again over charcoal. The steaming step is what separates Tokyo eel from the crisper Kansai style — the result almost dissolves on the tongue.

Order it as unadon (in a bowl) or unaju (in a lacquered box), with a sprinkle of sansho pepper, a cup of kimosui (clear eel-liver soup), and crisp pickles. It's a complete summer ritual in a single tray.

Where to try it: a 290-year-old eel house by Shinobazu Pond

Here's where staying in Yushima pays off deliciously. About ten minutes' walk from NAOKO'S HOMESTAY, facing Shinobazu Pond in Ueno Park, sits Izuei Honten — an unagi restaurant founded in the mid-Edo period, roughly 290 years ago, and now run by its ninth generation. Wild eels once lived in Shinobazu Pond itself, which is why Ueno grew into an eel-restaurant district in the first place. The novelist Mori Ogai was a regular; his daughter wrote that he often took her there for eel.

Izuei's tare uses just soy sauce and mirin, aged for weeks — the kind of simplicity that only works after three centuries of practice. And in late July there's a bonus: the lotus flowers of Shinobazu Pond are in bloom, opening in the early morning across the water. Lotus viewing at 7:00, unaju at noon — that's a perfect Tokyo summer Sunday.

• Go early or off-day. July 26 is the busiest eel day of the year. Arrive before opening, or have your eel on the 24th or 25th — the tradition is generous.
• Supermarket kabayaki is real too. Locals grab a pack, warm it gently with a splash of sake, and eat it over fresh rice at home — easy to do in a homestay kitchen.
• Budget note: good unaju typically runs ¥3,000–6,000. It's a once-a-summer treat, priced like one.

Where to stay: eat like a local, live like one too

Doyo no Ushi no Hi is exactly the kind of tradition you only catch by living in Tokyo rather than racing through it. Base yourself at NAOKO'S HOMESTAY in Yushima — a calm, historic Bunkyo-ku neighborhood with four stations in walking distance (Yushima, Ueno, Ochanomizu, Okachimachi) — and the city's food calendar comes to you: eel day in July, fireworks the same weekend, autumn festivals just ahead. Fully furnished monthly stays from ¥9,000/night, with the best rates on 1–2 month stays and a kitchen for your own kabayaki experiments.

“You feel like you're living in Tokyo, not just visiting.” — Tatyana, Portugal (stayed with her son)