大正偽りブラヰダル～身代わり花嫁と軍服の猛愛

Taisho Era Contract Marriage: The Substitute Bride and a Soldier's Fierce Love

I used to think there was no love in marriage... Until I met a fierce and passionate soldier! Despite being the daughter of a viscount, Asako is rejected by high society and treated as a nuisance by her parents. When a marriage proposal arrives suddenly for Asako's younger sister from none other than Captain Kido, a soldier known for his coldness, she doesn't hesitate for a moment. To protect her precious younger sister, Asako volunteers as... a substitute bride!