What is diabetes like in japan

Hi everyone.
I have been fortunate enough to be chosen for an exchange program to go study a year in Japan.

However, I have diabetes. I was wondering what the medical system looks like over there. Is insulin relatively cheap? How about if there are any emergency?

I will obviously get my own insurance company, but I'm interested in what it's like in general.

Thanks

Also, as a side note, what are the best options for part time work for some spending income? Is it being a tutor, or is it working for a small store or a business?