Teikoku Gunjin no Hatsukoi

Mari, the daughter of a servant, tries to save a child from a raging horse, but is saved by Hisame Saionji, known as the "Ice Captain." Mari is attracted to the captain, who is of a different social status, and when they meet again, Hisame proposes to Mari! But is there a reason for this marriage?! (Source: Shogakukan, translated)