Originally Posted by
rxrfrx
Would it make sense to try to buy this ticket from a Japanese travel agency once I am already in Japan?
My simple answer is NO.
One-way oversea tickets originating from Japan are
always extremely expensive, especially when you buy them in Japan. on the other hand, NRT/HND-HKG round trip ticket are usually quite cheap. You should try to make a round trip itinerary or open-jaw itinerary.