Demon Slayer: Infinity Castle Part 1, the first film in the series-ending trilogy, demolished its own records from the Mugen Train release with $50 million in receipts in its first 4 days in Japan. That would be a solid performance in the US at almost triple the population. Mugen Train went on to make almost a half a billion dollars globally, and if the trend continues, Infinity Castle will likely make hundreds of millions more than that.