There are tons of sites that sell (physical) Japanese simcards and ship worldwide, they're a bit pricey though. Just Google "Order Japanese simcard"
Here's a list of sites that rent Japanese phone numbers, look at the first reply: https://www.quora.co...eceiving-an-SMS
Do you need it for PayPal by the way? Because I registered a couple of accounts in the past with numbers from another country without a single problem.
Ok I’m retarded. I was trying to make a personal paypal account the whole time