 If you liked
Break Blade Movie 1: Kakusei no Toki
|
 ...then you might like
Kujira no Kora wa Sajou ni Utau
|
Both works features war between vastly different factions, as one of them is seeking for peaceful resolvement of the situation. The point of both works is more of an exploration of the psyche and the feelings of the main characters about all this, not solely the war itself.