Pretty hard, there are some services like sakura sim card and another that just uses your passport, but the rates/services are pretty meh. But it is a softbank

Pretty hard, there are some services like sakura sim card and another that just uses your passport, but the rates/services are pretty meh. But it is a softbank sim card, a JP number (thay may not be used for line verification sometimes) and the lowest priority data - meaning if you're in shibuya or shinjuku, sometimes you have no signal.