Comparing prices using exchange rates rarely give a good idea on the actual cost for locals. The Yen is at one of its strongest rates in history, with a dollar buying ¥239 in 1985 and ¥79 today.
With the Euro currently buying ¥100, eating out in Tokyo such as Sushi or Ramen is still cheaper than any non-fast food in Dublin or London. However beer for example is ridiculous, along with DVDs to name just a few.
So what would be a realistic exchange rate to get an idea for cost of living – €1/¥130 maybe?
Also what's the average salary like for degree educated office workers?