How trustworthy is it to get a tour/travel package from Groupon?

Don't get a tour. Get a flight to/from Tokyo, reserve hostels, get a rail pass. You'll have a much more interesting experience.

>>1068077
At those prices, it must be the most budget airline available. Room's might be cheap but you knew that going in.

More likely, meals are not included and you'll be paying a lot of extra fees and things where there's no reasonable alternative.

Expect them to make it up in the margins.