Airalo
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Airalo has built a global eSIM marketplace connecting travelers with local carriers. For Japan, it offers multiple data tiers starting at 1GB and scaling to 20GB, so you can pick exactly what you need for your trip. The app-based installation means you can set up your plan from home before you board, avoiding any connectivity gaps on arrival.
The service appeals to frequent travelers who want straightforward, competitive pricing without carrier lock-in. Plans are paid by data allotment rather than calendar day, which works well if your usage varies across your stay.