Think of some stuff to do and/or an event to centre the trip around
Negotiate a suitable set of dates with your comrades
Check prices for airfares and jiggle the dates until optimal
Apply for leave from work
- Chase management for receipt of request
- Confirm leave approval
Book airfares
- Figure out where you'll be and book accommodation
- How about travel?
- JR pass?
Car hire? http://rent.toyota.co.jp/en/index.html
- How many yens will you need? Buy some yens
TBC