Kansai Airport international arrivals has several SIM and eSIM counters within a few minutes walk of customs, covering both physical SIM cards and eSIM activation.
Where the counters are

SIM and eSIM counters are located in the arrivals area, generally clustered close together, making it easy to compare a couple of options before choosing.
Physical SIM versus eSIM at the counter
A physical SIM is straightforward if your phone is unlocked and accepts a nano or micro SIM. eSIM activation at the counter is similarly quick if your device supports it.
Tip: Pre-ordering an eSIM online before you fly is usually faster than the counter line on arrival, since it activates automatically once you land.
What to expect on cost
Pricing varies by data allowance and duration, and counters generally accept major foreign credit cards without issue.
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