Sounds like your Japan player is doing an awful lot on his 1st turn–that means his/her forces are spreading themselves quite thin. If you feel you can handle Germany, and Japan is the problem, designate either UK or USA to battle mainly Japan while the other fights Germany in Africa and by helping USSR. If UK, try TRing over INF from Syria/Iraq and/or Egypt T1 to India. Use the (remaining)Chinese to help. USSR should funnel over maybe 1 INF per turn to their Asian forces to build up a “wall”(as my friend puts it) in Yakut/S.F.E. With a minimum of effort you should be able to slow down the Japanese advance–always have a backup plan for anywhere the Japanese attack. When you are strong enough to avoid losing India for a turn, build a Complex there…
The USA vs. Japan is even simpler, though slower to yield results. Lend a bit of a hand in Africa/Europe the first few turns, and start building up against Japan in the Pacific. Fighters, Carriers, TRs, BMRs and SUBs are good early-turn builds. Once you have them scared they will do 1 of 2 things: 1.) Try to ignore you, whereupon you will hit them with your planes/attack-ships and back up with your TRs/INF, or 2.) Build up their own fleet, which will slow their advance in Asia proportionally.
Sounds like your Japan player may be overstretching in Asia and the Pacific a bit. Commit a few more forces against him/her T2 on and you may be surprised at the results…
Ozone27