Originally Posted by GaxxyFlyer

I wouldn't count on using a 2-4-1 if you're inflexible with dates. If it comes up then that's a bonus but it hasn't and now you're in the lap of the gods. Flexibility if the key to using companion vouchers.

You could also look at Beijing, there's often great availability and it's about 3 hours flight time to Tokyo.

Edit to agree with Eskimoboy, it's not a year but 355 days out that the flights are released.