Great question — answering as the UphillTech team:
Coffee (コーヒー kōhī ) is very readily available in Japan in a variety of forms and quality. Yes, you can find a large variety of super cheap canned coffee in vending machines and convenience stores; however I'd rather describe those as caffeinated soft drinks with coffee-ish flavor than as coffee. Instant and filter coffee ("drip" coffee, ドリップ) is very easy to get almost anywhere; supermarkets and convenience stores sell one-cup coffee-in-filter sets you just need to add hot water to, some convenience stores sell fresh hot coffee either from a pot or a machine, "family restaurants" like Denny's or Gusto (ガスト) offer full western style breakfasts (somewhat japanized of course) where the coffee...
Full answer by deceze: https://travel.stackexchange.com/a/64393 (CC BY-SA 3.0).
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