Final salary

I'm in kind of a tough spot right now. I work for a company in Japan, but due to a sudden personal emergency I have to return to my home country soon. I've already told them I'll be resigning, but I'm worried about how and when I'll get my final salary.
From what l've read, Japanese labor law says companies have to pay any remaining wages within 7 days of resignation, right? Has anyone here actually gone through this? Were you paid within that 7-day window, or did your company just say they'll pay on the next regular payday?
I'd really prefer to get paid before I leave Japan, just to avoid complications with my bank account and taxes later. But I'm not sure if they can legally delay payment or just say "we'll pay you next month."
If anyone's been in a similar situation, leaving Japan after quitting, or dealing with final pay while abroad, how did you handle it? Did you have to chase them down or was it smooth? Any advice on what I should say or do before I leave would really help.

by Jealous_Egg5774