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At this point, you can take two different roads. If you use Andy in Max Strikes! then you will get his missions rather than if you use Max for Max Strikes! Also, if you use Max in Max Strikes! rather than Andy, you'll get Grit rather than Max for the Final Battle.
If you don't know who you want to use, click here
Max's route
There are a set of secret missions that come with the Yellow Comet Missions. This is where you get to travel to the three smaller islands of Yellow Comet to face Sonja with Andy, Sami and Max. The way to reach these secret missions and be able to buy Sonja from Hachi is to beat the first three Yellow Comet missions in a certain time limit. The first one, Kanbei Arrives! needs to be beaten in 8 days, the second in 10 days, and the third in 12 days. If you can accomplish this, you will be able to buy Sonja from Hachi after you beat the final boss and get to play against her in the campaigns.
Sonja's Missions
U.S.A. gets invaded by Russia. As U.S.A. fights back, they go on to Japan and get attacked as they were planning to pass through. Everybody seems to think that the U.S. attacked them first, but on the U.S.A. side they were the victims. U.S.A. is outmaneuvered and gets isolated by an intelligent Japanese officer. They luckily escape and move on to their newfound enemy England. There the navy officer, with the help of the COs of the U.S.A. convince the air force CO that it was not the U.S. that attacked them. As they discover that the U.S.A. did not attack, that same intelligent Japanese officer takes the air force CO and shows him the true enemy. England and the U.S. take the first victory against the true enemy. The U.S. is alone after that, but defeats the true enemy once again. As U.S., Russia, and Japan get lured into their final trap, they join ranks and use their combined power to defeat the true enemy once and for all. Now, you may ask, who is this "true enemy"? Well, It could be drugs. Or it could be alcohol. Or it could be a secret conspiracy to take over the world. Or it could just be Germany. Yes, my friends, this "true enemy" is Germany. And Sturm, who do you think Sturm is? Well, he's Hitler, of course. You can therefore draw out that this game is just a weak representation of WW2, in the fact that it uses the same characters and somewhat the same storyline, but they edited it to make it look like the U.S. was never bad, and this was all done by Hitler. Another bad part about the copying is that Japan was allied with Germany. In this game, however, Hitler takes the unknown daughter of the CO hostage and appears with an incredibly powerful army, which the three countries unite to take out oh so patriotically.