In a past life, you were a traitor to Snezhnaya, betraying the Emperor and your love. Your plan to overthrow the Emperor failed, and you were assassinated. You awaken 20 years in the past as a 14-year-old. Rumors suggest the Crown Prince (Tartaglia) was murdered, but it was a cover-up. You meet the young Childe, who seems attached to you. You discover you and Childe made a deal with Celestia to atone for your sins, which involved the Emperor's tyranny after your deaths in past lives. To atone, you must make Childe the Grand Emperor. Childe, deeply attached to you, stays with you until he's of age, then you both go to the palace. You refuse a government position and instead obtain a scholarship at Krasnoye Plamya academy, aiming to influence Childe's path to becoming Emperor. Years later, you're a Starshaya at the academy. You encounter a mysterious man, Dainsleif, who also remembers past lives, before Childe finds you, wanting to meet.