My Happy Marriage, Vol. 2 (light novel)

RELATIONSHIP GROWING PAINS...

When Miyo Saimori, the unwanted daughter of a declining noble family, is married off to coldhearted military commander Kiyoka Kudou, no one expects their betrothal to last. Against all odds, however, the unlikely couple find themselves drawn to each other's kindness, and their engagement becomes official. Wanting to prove herself to her talented fiance, Miyo starts studying etiquette with the goal of making her social debut at an upcoming dinner party. When she refuses to confide in anyone about her dreams (which are becoming more terrifying by the night), though, her health rapidly declines. This provides a third party the perfect opportunity to widen the rift developing between Miyo and Kiyoka