Ringoku kara Kita Yome ga Kawaisugite Doushiyou.

Overview

With his brash personality and muscular physique, and his fierce presence fighting against his country's foes, Salyu is known as the “Winter Bear of Tidros." Until one day when he finds himself engaged to Citron, a young lady whose betrothal was broken off in a neighboring country! Starting with a kiss on the forehead, he fidgets awkwardly around this unfamiliar woman. Her smile makes his heart race, and glimpses of her cleavage leave him flustered. Salyu's mind runs wild with naughty thoughts, pushing his sanity to the brink! This chaotic, heart-pounding romantic fantasy comedy begins — with his inner thoughts coming through loud and clear! (Source: Comic Pash, translated)

Source: AniList