For the first time in 34 years, Sumo wrestlers brought Japan’s ancient sport to London, and the event turned into an unexpected diplomatic triumph. From selfies at Big Ben to strolling through Trafalgar Square, Japan’s biggest athletes became the country’s most powerful ambassadors promoting culture, tourism, and tradition without saying a word. What started as a three-day event has turned into a viral soft-power moment that the world can’t stop talking about. Rupha Ramani looks at how Japan turned muscle into diplomacy and why Sumo in London can be called the most successful accidental PR campaign of the year.