Take it from me (Obviously) It's not a manga, it's a novel, though i've heard of manga adaptions. The story order is confusing, I really had to record this. So, if you really want to read it in chronological order, (See the story progress) Then: Volume 1 - Chapters 2 & 3 Volume 8 - "First Day" Side Story - Aria in the Starless Night ME 7 - Continuation: Aria in the Starless Night ME 8 - Rondo of the Transient Sword ME 9 - Monochrome Concerto Volume 2 Chapter 4 - Red-Nosed Reindeer Volume 2 Chapter 1 - The Black Swordsman Volume 8 - A Murder Case in the Area Volume 2 Chapter 2 - Warmth of the Heart Side Story - Sound of Water, Sound of Hammer ME 4 - Cold Hands, Warm Heart Then proceed to chapter 4 of volume 1.
Read 16.5 if you want. After chapter 17, read ME 6 - Algade Showdown Then Volume 2 Chapter 3 - Morning Dew Girl.
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.