Moto Keikoku no Bijo to Flag Crusher Outaishi: Tensei shitemo Shokei End ga Kaihi Dekimasen!?

Azalea, a duke's daughter, was once known as the "Wicked Woman Who Ruined the Country" in her previous life and was executed on those false charges. All she wanted in her second life was to live peacefully without being involved in politics or power struggles... but for some reason, she was chosen to be Crown Prince Lotus' fiancée.

Lotus is a problem child that even his parents, the king and queen themselves, have no idea how to handle. Even though Azalea is being thrown into chaos by the eccentric actions of this extreme genius, gradually, she finds that she can't leave the boy alone...

(Source: Kadokawa, translated)