The story pleased me. By having a lot of talk about "military strategies" and relatively little action, the anime is easy to "drop"; but for those who do not mind understanding a bit about the universe of the characters, these endless conversations are no big deal.
The protagonist Theo does not look anything like the stereotype of male protagonism. Theo is determined, acerbic, knows what he wants and does not mind losing one thing to win another. His idealism might well lead the character to the stereotype of the good revolutionary, but it is a good thing that it does not.
The female protagonist Siluca is adorable, has personality and is driven by well-established goals. The fact that she saw Theo as a means of securing her purpose, without at the same time disrespecting it, is the kind of rare move in the anime.
The highlight for the other characters is the Princess Marrine; Because of it I will always remember that Grancrest Senki as the anime of the princess who has committed prostitution to try to win a war.