If that happened in North America, you could just use TextNow to create a SMS-capable phone number and use it out of your browser. I think there is no such thi

If that happened in North America, you could just use TextNow to create a SMS-capable phone number and use it out of your browser. I think there is no such thing in Japan: a website where anyone an create a throwaway account and get a phone number in any area code. Telephony is tightly run there. There are some commercial services like that that will give you a phone number, but you have to submit paperwork proving that you're a resident of Japan.