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>>2678737a lot of buildings have external stairwells that lead to all floors and sometimes the roof as well. most of the times they're locked but some are open. you might have to jump a rope or a little gate somewhere along the way. just keep an eye out. normally you don't really run into anybody but if you do, just give em a friendly nod and continue. if they won't let you, act like a dumb tourist and you're usually forgiven. the japanese think all westerners are retarded anyway. as long as you don't force any locks you'll be fine.