Reimei no Arcana

Princess Nakaba of Senan is forced to marry Prince Caesar of the enemy country Belquat, tantamount to becoming a hostage. While Caesar is pleasing to the eye, he is also selfish and possessive, telling Nakaba outright: “You are my property.” With only her attendant Loki at her side, Nakaba must find a way to cope with her hostile surroundings, her fake marriage...and a mysterious power!

(Source: Viz Media)

Note: Includes 12 extra chapters.