Ummm... (Was GONNA say Hellsing) -Rosario + Vampire (Not as ecchi as it's anime counterpart, if there is any at all) -Dance in the Vampire Bund (But this MIGHT be a bit mature...).
Rosario to vampire the manga it has action romance and comedy. The anime has to much fan service and sucks. Its also a harem and its not mature or echhi at least to me hope this helps.
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.