This title is extremely clickbaity. If a few people in Japan believe something that nobody else believes, that thing is not "only true in Japan", nobody knows if it's true anywhere.
Well, not quite. Sometimes believing in things makes them true.
Spaniard here, this is nonsense, I'm pretty sure everyone in the world experienced a nervous breakdown/light panic attack.
Just because Puerto Ricans and Spaniards speak dialects of the same language doesn't make our culture all that similar, as you surely know. I would even say there is little in common culturally.