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You should take the effort to pick up a minimum of Japanese if you want to stay for more than a few weeks.
Doing student exchange is good, be sure to pick up a fair bit of Japanese even if your classes are in English. They may not be if you're attending anything less than College.
If you're going as a tourist, zero Japanese is necessary cause they're used to tourists babbling in a foreign language and will just point you where you need to go (or give you a menu and you point at what you want!)
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