Estelle, once a brave knight in the Kingdom of Ersha, meets a tragic end only to be reborn four years later as Lucifela Aydin, the haughty daughter of a count in the conquered Empire of Jansgar. Shocked by her new reality, she learns she is engaged to Zedekiah Heint, her former rival. As she grapples with her past and present, Estelle strives to unravel the mysteries surrounding her demise.