Moto, Ochikobore Koushaku Reijou desu.  

Claire Martino was born into a wealthy family and had everything anyone could dream of, including a prince as her fiancé and a promising future ahead of her as Nostons most powerful mage. However, things took a turn when all of the family's magical talent went to her half-sister, Charlotte, leaving Claire feeling lost and tarnished. She left behind everything she had ever known and set out on an adventure in search of freedom. Despite facing many challenges, Claire's bravery and determination helped her overcome obstacles and find success. To her surprise, she discovered that she was a character in the popular dating sim game Upstart: Eternal Love, where she was periodically teleported to modern-day Tokyo. However, Claire remained determined to save the day and unlock the good ending of her own route.

Moto, Ochikobore Koushaku Reijou desu. began as a web novel on Shousetsuka ni Narou on March 9, 2020. Mag Garden has released a revised and illustrated version of the series since December 10, 2020 under its Mag Garden Novels label.The series has been published digitally in English as Formerly, the Fallen Daughter of the Duke by J-Novel Club under the J-Novel Heart imprint since September 12, 2022.