A secondhand bookshop in Hong Kong, spring 2025. The manga in the window has a torn cover and a price sticker that has been changed twice, each time upward. A woman in her twenties buys it without opening it.
Two months later, a Greater Bay Airlines counter agent explains, for the third time that shift, why the Tokushima route now runs twice a week instead of three times. "Reservations," she says, and leaves the rest of the sentence where it is.
5 July 2025. A convenience store in Tokushima opens at its usual hour. A commuter buys a rice ball. A delivery truck double-parks outside for four minutes, as it does every Saturday. Nothing else happens, anywhere in Japan, all day.
The book at the centre of it is 私が見た未来 (Watashi ga Mita Mirai) — The Future I Saw — a 1999 collection by manga artist Ryo Tatsuki, presented as a diary of her own precognitive dreams. Fifteen entries, most of them vague enough to mean almost anything. One line on the original cover reads, roughly, "a great disaster, March 2011" — no location named, no magnitude, no mechanism, nothing in the story pages that ties it to a specific event. Tatsuki has since said she herself was not sure at the time what the date referred to. Then March 2011 arrived, the Tōhoku earthquake and tsunami hit, and a throwaway note in an out-of-print comic became, retroactively, a prophecy.
That reputation is what made the 2021 reissue dangerous. The 完全版 ("Complete Edition") added a new dream: the real disaster, it said, comes in July 2025, when the seabed between Japan and the Philippines cracks open and sends waves three times the height of the Tōhoku tsunami into southwestern Japan. No source in seismology works remotely like this — real earthquake science does not produce a single date circled on a calendar decades in advance — but a book that appeared to have called 2011 now had a sequel, and sequels sell themselves.
It spread furthest in Hong Kong and the wider Chinese-speaking internet, boosted by feng shui commentators treating the manga as a serious source and supercharged, by pure bad timing, when a real earthquake swarm hit Japan's Tokara Islands that same June — over a thousand tremors in a few weeks, none connected to any megaquake theory, all of it landing in newsfeeds next to the countdown to 5 July. Arrivals from Hong Kong fell 11% year-on-year that May. Greater Bay Airlines cut its Sendai service from four weekly round trips to two, thinned its Tokushima flights, and by September suspended the Tokushima route outright, saying plainly that "reservations are stagnating due to the rumours." A handwritten note in a 26-year-old dream diary had just re-routed actual scheduled aircraft.
In Japan, almost nobody blinked. Tatsuki's own publisher put out a statement in her name saying she was "not a prophet" and urging people to act on expert information, not on dreams. When the Tokara swarm made the coincidence look damning, a Japan Meteorological Agency official, Ayataka Ebita, told reporters flatly: "It is absolutely a coincidence. There is no causal connection." The JMA's own website goes further, filing predictions of this exact shape — precise date, precise disaster, no data behind either — under a single blunt label: デマ, hoaxes. Its position has not moved in years: nobody, anywhere, can currently forecast the time, place and size of an earthquake in advance. Not a seismologist with forty years of instrument data. Certainly not a diary of dreams.
5 July 2025 came and went as an ordinary Saturday. Trains ran on schedule. Convenience stores restocked at their usual hour. Three and a half weeks later, on 30 July, an 8.8-magnitude earthquake did strike — off Kamchatka, in Russia, more than 1,800 km from Japan, sending tsunami warnings across the Pacific including the Japanese coast. Seismologists were unambiguous that the two events shared nothing but a rough season. By the end of the year, Japan had welcomed a record 42.68 million international visitors — its highest annual total ever, the empty Hong Kong seats already absorbed into a much larger recovery.
The easy read is that Japan stayed calm because it doesn't take megaquakes seriously — old news, overexposed, shrug and move on. It is closer to the opposite. Japan runs the most heavily instrumented earthquake-warning system on Earth, and in August 2024, after a magnitude-7.1 quake off Hyūga-nada, the JMA issued its first-ever Nankai Trough Earthquake Extra Information advisory: an official, government-published warning that the odds of a much larger Nankai Trough megaquake — one long-term estimate puts it near 80% within 30 years — had measurably risen. That is what taking the threat seriously actually looks like in Japan: a probability, not a date; a prefecture-by-prefecture evacuation plan, not a countdown. A system built to say "sometime, we don't know when, brace anyway" will never out-viral a book that hands you an exact Saturday — and the country that built the system knew, better than anyone reposting the countdown, exactly how much an exact Saturday was worth.
- The 1999 cover note read only "a great disaster, March 2011" — no place, no magnitude, nothing in the actual story tying it to a tsunami. Tatsuki has said she was not sure herself what the date meant when she drew it.
- Hong Kong arrivals to Japan fell 11% year-on-year in May 2025. Greater Bay Airlines cut Sendai from four weekly flights to two, reduced Tokushima services, and suspended the Tokushima route entirely from September, citing rumour-driven booking declines by name.
- The predicted 5 July megaquake never happened. An unrelated 8.8-magnitude earthquake struck off Kamchatka, Russia on 30 July — 25 days later and nearly 2,000 km away — and Japan still closed out 2025 with a record 42.68 million international visitors.