One rough possibility
Germany is victorious in Europe, and the boys are home by Christmas (1914)
The war was short, and peace terms weren't too harsh overall, though France gets the worst of it. Germany's colonies in the Pacific are taken over by Japan, or most of them, anyway. US-German relations aren't tainted by unrestricted submarine warfare.
Germany is unlikely to be able to project enough power to fight Japan by itself. Japan has the home court advantage, and Germany needs to keep enough forces close to home to defend the country.
Two possible allies for Germany, both difficult to manage, but possible.
1. Russia, since both are smarting from loosing territories to Japan. Take some work to get the nations on the same side, but I suspect that it could be done.
2. The USA. The USA has seen Japan as a potential enemy for some time by 1914. For that matter, if a Yankee--Japanese war breaks out, it might be Germany jumping in. The Anglo-Japanese alliance would not be a factor if Japan attacked the USA...and if Germany jumped in afterwards, Britian would be very foolish to join also. I suspect that both the US and Germany would offer some reassurances concrning British territories in the area.