Japan is very hard to play. The overwhelming need for transports makes it even more difficult. They start with 3. J1 purchase is 2 Transports and 2 Subs.
Japan in essence has two theaters to fight in. Mainland Asia and the Pacific.
My objective in Asia, is to get Calcutta. First cut off the Burma road as fast as possible. Second funnel as many men as you can as fast as you can toward Calcutta. The only way to achieve this is to use your three transports and move men and artillery along the coast to Kwangsi. Along with your non-carrier air force. Take and hold Yunan as quickly as you can. If you can take it on J1 and withstand the Chinese counterattack, land your air force there J2. J3 attack the UK in Hong Kong and Malaya, and begin strategic bombing of Calcutta with fighter escorts. The whole time half of the fleet (2 of the 3 starting Carriers) is helping along the coast and assisting with the capture of Malaya and Hong Kong.
I view the Pacific as Japan as a triangle. The three points being Tokyo, Malaya and the Carolines. For the first three turns my focus is so much on the Calcutta, I just hope that the US doesn’t come wipe out what little of my fleet is left in the Carolines. I stack on the Carolines and put a Destroyer in SZ16 to block any attack from Hawaii on the undefended home island. (I hate this tactic, but it becomes a necessity at times). If by J3 I can spare a transport for the Carolines I can begin a push toward the Solomons. Simply adding a couple of ships to the Carolines in the setup would make an enormous difference here. As it is with a Carrier and Destroyer, its very thin. Add a transport, sub and cruiser and the Japanese can begin to prosecute some kind of offensive against ANZAC. With the current setup as soon as war breaks out with the UK, ANZAC is at 15 IPC since they easily take Dutch New Guinea on their first turn. Also if my assault on Malaya doesn’t succeed, then he is at 20.
I don’t know if on J1 in place of 1 of the transports and one of the subs if I bought a Minor IC and place it on Kiangsu if that would free up some more resources to focus on the Carolines and DEI. I typically cannot get all of them and do everything else I am trying to do on the mainland. My current game against a friend of mine he moved a transport and some men out to the DEI as the UK and has half under his control. At this point I don’t know if it worth re-directing my efforts towards taking it since I am within 3 turns of taking Calcutta. If I distract from that it pushes that out. I know with all four under my belt it is worth 20 IPC, but I see an opening in India and I am going to take it. He also is pestering me with Russia in the north. He is down to six men, but I have a scarce force of a tank and two artillery in Korea.
I am winning this game as Axis, but that is mostly because of some bad dice for my opponent and one or two mis-steps on his part. I have made some of my own but his bad dice and my good dice saved me. In Europe I took UK on G2 and have a formidable force pressing on the Russian border for the start of turn 4. The Italians have all of the Mediterranean and are about to push into the middle east and use their Navy in the Atlantic to defend Western Europe.