Yomei Wazuka Dakara to Tsuihou Sareta Seijo Desu ga, Junrei no Tabi ni Detara Chou Kenkou ni Narimashita

Princess Platina, a devoted saint to her kingdom despite enduring cruel mistreatment, receives devastating news—she doesn’t have long to live. Her stepsister seals her fate by ordering her on a harsh pilgrimage to the Holy Land, effectively banishing her from the royal castle. Eisen, a captive knight, is forced to accompany her as both attendant and witness to her death. What will become of their lives on this journey...?

(Source: Manga Up! Global)