just to double check,
you said being offered 4,200,000 annually, after tax and health comes to 350,000 per month, with 6 months contract.
1. double check your tax and health deduction. also pension.
4,200,000 / 12 is 350,000 not yet consider tax/health deduction.
note that there will be pension deduction as well.
recheck your value.
example gross 350,000 after tax, health, pension etc., you'll end up with around 290K~300K. deduction ranges from to 15~ 20%
2. most company reimburse your commuting fee. there are limit
to the amount you can claim, defer from each company. it
depend on where you live and your mode of transport. normal
is you buy the commuter pass and get reimbursed for the
amount you paid. so check with them and try to get it included
in your contract.
3. standard labour law is that you'll be paid 1.25 of your hourly
pay for OT work, and another rate for OT 10 PM onward.
4. As for accommodation, try ... advise. try to find out exactly where your workplace is, the nearest station. use
www.hyperdia.com to workout the commuting time and fees.
Labour related law :
http://tokyo-foreigner.jsite.mhlw.go.jp/english/seekers_1/spec/spec_1c...all in all if you get 350K p.m. (after all deduction - please check again) it is not too bad considering in Japan, permanent worker, new grad get ave. 200K-250K per month but they get bonus as well.
thing will be whether you think you're well compensated for your experience, but then again 6 month experience working in Japan might look good on your CV. maybe you can find other work opportunity to continue staying in Japan.