I'm looking to pick up a prepaid SIM with both voice and data at Haneda Airport soon. Do I understand correctly that my only choice, meaning offers data, voice & has a booth at Haneda, is Softbank? Per the Japanese page, they offer a SIM with 700MB valid for 7 days at ¥2916.
The official Haneda page lists a bunch of others, but none seem to offer prepaids. (Except GSM Rentafone, but they only offer the same Softbank SIM.)
Update: Also open to meaningfully cheaper off-airport options (hotel delivery etc). Nano SIM, two weeks, at least 1 GB data but preferably more and/or the ability to top up.