Ryuuou no Chouai: Hanayome wa Sougen ni Midare Saku

Princess Gyokuyo of the Touka Kingdom was nursing wounded prisoners of war from the enemy Hokuen kingdom, when she meets a young man with emerald-colored eyes who had come as an envoy of the Hokuen. The young man with the intense gaze forcefully tries to woo Gyokuyo...!? (Source: Rimacomi Plus, translated)