2nd year JET here

I have found that the salary is more than enough to live on hassle-free, with enough left over to save for a very rainy day. Of course how much you can save/ avoid spending, will be dependent on your lifestyle, your rent and basic living costs. I live near the middle of a small city (10 minute train ride to the center) and fortunately my rent is partially covered by the BOE, meaning that I pay 20k a month as a opposed to 50/60k, yay

I small run down of my monthly expenses are probably:
20k - rent
4/5k? - iphone
5k - internet
3k - car park space
6-10k - electric/water/gas (in winter I use more electric because its damn cold)
7k - gym
I think those are the bills I pay on a monthly basis in addition to the 40k that gets taken away for insurance/pension (however I get a percentage of that back for 1-3 years here)
Some weeks I can spend hardly anything but then other months I may wonder where the heck my money went, but usually I can at least save around 100,000-120,000 yen a month and still buy what I want from the supermarket and go out most weekends. Althoughhhhh on the new salary scale for incoming JETS there will be a bit of a decrease in your take home amount (40-60k? ive no idea tbh) so for any current/former JETS commenting, expect you to save slightly less than the average amount. Of course you could just do like a previous JET did and be super conservative with your utilities, i.e re-using sink water, never using the AC etc and maybe you will save the odd extra pence or 2