It's not uncommon for off-topic or non-constructive questions to be upvoted. Questions that appeal to many but don't generate useful answers still tend to be highly upvoted. This is why close votes are completely decoupled from question scores.
I don't see this specific question as wildly off-topic, though. It's a question that a traveler is far more likely to ask than a local, after all.
Then it comes down to what a travel question is. You could look at a picture of the pyramids, but people travel across the world to see them. Is wanting to hear a sound or experience an event in Japan any less legitimate a reason to travel?
(not saying I disagree, just that I don't have an answer to my own semi-philosophical question)
I don't see any problem with this question at all. It's a random reason to visit Japan, but hey, whatever! Where do you draw the line between what's a valid reason to travel or not? And for that reason, I did not close the question. You should feel free to close vote and if enough people in the community agree, then it gets closed. If you have a problem with the question, you downvote. Standard StackExchange 'procedures' already exist for this scenario, use them! :)