Koukyuu no Ikenie Hi: Douse Shinu no Nara, Koutei ni Aisaremasu

Chun-Li, who can predict people's deaths, has been oppressed by her family for being cursed. One day, she is married to Emperor Seiran, who is rumored to cause those around him to die one after another. "I don't mind dying for Chun-Li," her own father thought, so he forced her into the harem as a "sacrifice." Chun-Li thought she could die at any time, but Seiran, who learned of Chun-Li's ability to predict death, became interested in her.

(Source: Starts Shuppan, translated)