Their underground will take it. You know, the ones with giant full body tattoos.
You mean the Yakuza?
Yes. Them. They will accept bitcoins as donations and help their country in times of natural calamities. During normal times, they'll accept bitcoin as payments for whatever it is they usually do to accept the Yen.
I'm pretty sure they've got geeks on their payroll already. Those guys will accept bitcoin as part of, or in replacement of their salaries.