Himekishi wa Barbaroi no Yome

Sinopsis

"Just kill me!" These are the words of Serafina de Lavillant, the strongest female knight in the West. After being defeated in a war with the East, she has become a prisoner of the barbarians! What awaits the captive Serafina is a life of revenge, torture, and humiliation... or so she thought! What she is offered instead is a marriage to the barbarian king?! An intriguing tale of otherworldly marriage is about to begin! (Source: Kodansha)