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The Goal: Released in April 2021, the green, tadpole-like character (dubbed "Little Mr. Tritium" or "Tritium-kun") was created to make the science behind the Fukushima wastewater release "easy to understand".The Message: Promotional leaflets and videos aimed to show that tritium was safe, existed naturally in the environment, and would be heavily diluted before being discharged into the Pacific Ocean.Backlash and RemovalThe Reaction: Local residents, fishing communities, and social media users criticized the character, stating that using a "kawaii" (cute) mascot trivialized serious nuclear safety risks and amounted to image manipulation.The Apology: Officials withdrew the campaign materials within 24 hours, and the reconstruction minister later apologized for offending the public, replacing the character design with a simple letter "T".