Thanks for your reply
I'm bringing an extra 30,000¥ just in case the 31,000 for food and 20,000 for trains isn't enough, but hopefully I won't spend too much of it. But, of course I'm gonna try some good quality japanese food some of the time
As much as I'd like to see other places of Japan, I'm a student and haven't really budgeted enough money for the trip to be taking trains to places like Kyoto or Osaka, unfortunately....
Maybe next time.