8-dome no Jinsei, Kirawareteita Hazu no Outaishi Denka no Dekiai Route ni Hamarimashita: Okazari Sokuhi nanode Douzo Okamainaku

Princess Fiona marries Othniel, the crown prince of the enemy kingdom, in a political arrangement. But living as a hostage in enemy territory, she is repeatedly executed, poisoned, and worse... but she keeps getting reincarnated, until she enters her eighth life. I don't want to die anymore! She decides to live a simple life as an inconspicuous concubine. She just wanted to live a carefree life with her dog, a holy beast (?) that she brought from her homeland. But her natural enemy, the crown prince, becomes unexpectedly obsessed with her, and this time they are heading straight down the doting route! (Source: Berry's Cafe, translated)