Taishou Itsuwari Bridal: Migawari Hanayome to Gunpuku no Mouai

"I'll have you birth my child in place of your sister." Asako thought that there was no love in marriages... but the fingers of this cold-blooded soldier were unexpectedly sweet, passionate, and fierce...
Asako was despite being the viscount's daughter shunned in high society. One day, a marriage proposal arrives suddenly for her younger sister. The prospective groom? None other than Captain Kido, a renowned soldier known for is ice-cold demeanor. Rumors swirl that he seeks a bride solely to bear his children... To protect her precious younger sister, Asako volunteers as a substitute bride. Thus begins a false marriage for the sole purpose of bearing a child...?!
(Source: Sueiseisha)
Note: Episode 1 received an advanced distribution on AnimeFesta on September 13th, 2024. The start date reflects the start of the regular series broadcasting.