Cinderella's older sister reluctantly marries the prince ~The substitute Crown Princess enjoys a slow life in the imperial palace~

Adelina, Cinderella's stepsister, is forced into marriage with the nation's beloved "handsome prince" after Cinderella elopes with a wizard instead of accepting his proposal. Though the prince declares, "Even if we marry, I will never love you," Adelina has no objections! He's free to have mistresses or concubines—she plans to live as a decorative queen, enjoying a laid-back royal NEET life in a remote palace surrounded by fluffy companions. However, as she pursues her goal of a peaceful life and an amicable divorce (with a generous settlement), the once-distant prince starts to take an interest in her...!?