Yes, ef: A Tale of Melodies is the sequel to Memories. However, even though it's a "sequel", it can really stand on its own because it follows different characters. The main characters from Memories do appear in Melodies, but only very briefly.
Melodies follows more of the minor characters (Mizuki, Kuze, Yuu, and Yuuko) from Memories.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.