Aldnoah.Zero, Egao no Daika Recommendations
The two series have a similar world, a similar set-up for conflict, characters with similar traits and circumstances and are largely character-driven.
In both stories, two sides (nations in EnD, an empire vs. a union of nations in AZ) are fighting a war over resources. One side can't feed its people due to environmental circumstances of the land they inhabit. One side is technologically superior to the other due to a mysterious energy source available only to them. Thus they have more powerful mechs while the other side has strength in numbers. There's an idealistic, peace-loving princess leading one of the waring nations, being more of
It has that same Himedere, where it involves a princess to another MC in a setting of conflict, but A0 was more like the mc never get's to have the Hime, while in Egao it was more of a yuri thing.