Heroine ni Tensei Shitaga, Ateuma wo Suki ni Natteshimatta

A woman awakens in a comic as the female lead, Cinderella, and quickly encounters a grim fate. She is pressured into marrying the male lead, Haynes, and stripped of her scientific accomplishments. She becomes a pawn for Haynes and his true love to display their romance, ultimately leading to her death. Originally a top scientist, she finds this outcome unacceptable. Lester, the secondary male lead, is kind and selfless, defending the heroine and the country, even at great personal cost. With her new presence, she aims to change her destiny. She seeks to protect Lester and the Federation, forging a new romantic story on her own terms.