Moto, Ochikobore Koushaku Reijou desu.

Claire Martino once possessed everything a noblewoman could desire: an aristocratic upbringing, a betrothal to the crown prince, and the destiny of becoming the most formidable mage in the kingdom of Noston. However, her idyllic world shatters when her family’s magical lineage unexpectedly manifests entirely within her half-sister, Charlotte. Stripped of her engagement and left with a ruined reputation, Claire abandons the only life she has ever known. Rather than succumbing to despair, she embarks on a bold journey to claim the independence she has always secretly longed for. Armed with unwavering dignity, hidden talents, and immense courage, Claire faces every obstacle in her path—until she uncovers a reality far stranger than any magic. She discovers that her entire existence is merely a narrative within Upstart: Eternal Love, a classic dating simulation game. Periodically pulled into modern-day Tokyo, Claire learns that she was never meant to be the heroine; she is nothing more than a forgotten side character. Refusing to accept this predetermined insignificance, she takes control of her own story. By intervening where she was never scripted to act, Claire sets out to save the day and unlock the perfect ending for a route that was never supposed to exist.