So, this is a level of shakespearean esc classic, it is like watching Berserk, Star trek. Star wars, game of thrones and meets world history. It is slow but if you go into it knowing this you will enjoy it the journey is worth the slow burn. Show does a great job of never taking sides and letting you decide what is right. Its great watching a show taking the character arcs from episode 1 to the end. I would suggest the following order to watch it,
My Conquest is the Sea of Stars
Overture to a New War
Main OVA series.
Overture to a New War
Main OVA series.