When the marquise's daughter, Bertyl, wakes up, half a year has passed. She realizes that during this time, a person from another world, Minori, possessed her and managed to get along with her family, who hated her, and her fiancé, who found her annoying, in just a few months. After the possession ended, Minori appeared in this world in her original body. The reason for the possession didn't matter. Bertyl, who was supposed to have died from illness, resented her family and fiancé for accepting her so easily when she was possessed by someone else. When she realizes that time has somehow been reset to three years ago, she decides to spend her remaining time freely and leisurely, knowing her fate is to die soon. She even proposes a contract marriage to the young head of the Duke of Jube's family, but... 'I love you, Bertyl.' The duke, who had somehow come to genuinely adore Bertyl, complicates her plans.