Firefly Wedding(2023)

Hotaru no Yomeiri

It is the Meiji era. Satoko is born of a prestigious family and blessed with great beauty, but she is sickly and is said to have a limited life expectancy, so her only dream is… a convenient marriage to benefit her family. But suddenly, she is targeted by a mysterious assassin...!? Trying to survive, Satoko makes a desperate "proposal" to the killer...!?

A high-class lady and an assassin... A suspenseful love story about a contract marriage between two people who never should've met!

(Source: Ura Sunday, translated)