Marietta-hime no Konrei: Danna-sama, Suteki Sugimasu!

Marietta, the youngest princess of Stellaus, is arranged to marry General Belvant of the powerful military nation Oltaire. He is known for his strength and intimidating presence, while Marietta is described as fragile and delicate. Though many feel sympathy for her, Marietta secretly finds the general attractive. The story follows the relationship between the 30-year-old general, who has a fearsome appearance but is kind, and the 18-year-old princess as they navigate conflict and affection.