There are 3 flights from all Berlin airports, Germany to Japan, operated by 1 airlines. You can fly low cost from Berlin to 3 cities in Japan.
Nagoya
Osaka Kansai
Tokyo Narita
Do I need Travel insurance?: Some low cost carriers offer you travel insurance by default. This insurance covers you for the duration of your flight/trip. If you already have a comprehensive health insurance policy, you are probably covered much better than you would be with the travel insurance offered by the airline. In this case, there is no point buying travel insurance together with the flight ticket.