Aisare Seijo wa Yamiochi Akayuku wo Sukuitai

Due to her lack of magical powers, the count's daughter Sufia has been trapped in her house from a young age. Upon her father's remarriage, she sees her new stepmother and stepsister. From this comes a revelation: she has been reincarnated in an otome game. According to the storyline, Sufia will suffer under the thumb of her stepsister, Lily... But with her positivity and composure, Sufia is unmoved! Furthermore, in order to save her favorite character, Evuard, who is bound to fall into evil, Sufia begins manipulating her sister from behind the scenes. Sufia succeeds in preventing his downfall. After using her knowledge of the game, Sufia acquires the title of "saint" and enrolls in the magic academy! No matter what, she resolves to save the other characters as well! Thereupon, perplexed by Sufia's actions, Evuard begins showing an interest in her...? This is the story of an overwhelmingly positive heroine seizing her own happiness! (Source: Overlap, translated)