Taishou Itsuwari Bridal: Migawari Hanayome to Gunpuku no Mouai

Sinopsis

Asako, despite her status as a viscount's daughter, is shunned in high society. One day, a marriage proposal arrives for her younger sister with Captain Kido, a renowned soldier known for his ice-cold demeanor. Rumor says he seeks a bride solely for the purpose of bearing children... To protect her precious younger sister, Asako volunteers as a substitute bride. (Source: TVDB)