Heika, Kokoro no Koe ga Dadamore desu!

Sietsye, a princess hailing from a small country, traveled a long way to the powerful northern Kingdom of Verscia so as to wed its ruler, the haughty and overbearing Emperor Gaizel. The lonely Gaizel was a man known as the Ice Emperor, and is as frightening as he is revered. But, when faced with him, his inner thoughts - a sharp contrast to his icy demeanor - drift over to Sietsye, going far beyond her wildest imaginations—?! Thus begins the story of a love blooming out of a political marriage. (Source: Kadokawa, translated)