Dokuiri-hime no Yomeiri

Akari was born into a special family whose bodily fluids are poisonous. After her parents died, she worked as a maid in her uncle's house, but she was mistreated because she was considered "creepy" for hiding the poison in her body. One day, Yuki, the wealthy owner of a large brothel, visits Akari's house. Yuki has prepared a huge sum of money and wants to take Akari as his wife, but he is hiding a secret...?

(Source: Kodansha, translated)