HimeYoku: A Sacrifice of Lust and Grace [EN]

Hime to Aiyoku no Sacrifice
Solid country – a great power that has won the war between nations,
Attacked by a man.

Cardo held a strong grudge against the king,
The main character, Cardo, who took action for revenge,
He takes control of the castle with the help of the “devil” he is working with.

He showed no interest in the affairs of the country or the people, and as revenge against the king,
Cardo uses the abilities of the demons to start training Princess Fiana.

Seeking vengeance, a young man named Caldo single-handedly storms the Kingdom of Solide, whose ruling dynasty has long prospered from the horrors of war.
Consumed by hatred, he forges a series of “unholy pacts” with unseen forces to ensure victory, but on seizing the castle, he seems uninterested in Solide’s people and politics, instead turning his demonic arts to the lovely Princess Fiana…

[From Shiravune]