Based on service of Xiamen Airlines you may consider to book very cheap return flights from Europe to Tokyo. Return tickets are starting already to €305. Including all taxes and fees and checked in luggage. Look for flights departing from Asterdam, Brussels, Italy, Spain and probably more. As this is possible error fare deal please do not call airline nor booking agent. Also this deal can be fixed or sold out soon as only very limited travel dates are available. Be fast if you want to book such a low tickets to Japan...
if interested in this great opportunity to Japan please look for limited travel dates within November 2015 and 31st of January 2016. Max stay 1 month. This includes travel dates over Christmas holidays! Please refer to below booking samples if interested in this deal.
Booking samples
Travel dates can be checked here using +- 3 days searching tool.
All these airports in Europe are well connected with rest of the Europe by many low-cost carriers. The easiest way how to book your connection flight is through Skyscanner. You may check some affordable accommodation via booking agents such as Hotelopia. They are now also offering 6% promotional code for additional discount off hotel rooms. More details to be found here.
Booking sample of cheap return flights from Europe to Japan from €305 here. In this case you would be departing from Amsterdam to Tokyo on 27th of November 2015. Return flight from Japan back to Europe would take place on 6th of December 2015.