 If you liked
Souin Gyokusai seyo!
|
 ...then you might like
Peleliu: Rakuen no Guernica
|
Both are a portrayal of soldiers during WWII sent to an island in the Pacific Ocean to fight the american army, showing war in all its cruel and crudely way.
They're also similar in representing people in a simplified, or even chibi-style in the case of peleliu, while having more realistic backgrounds.
The main difference in treatment is that onward towards our noble deaths is an autobiography while peleliu is the source of a group of historians and can feel more scripted and fake compared to it.