After reincarnating as Cain, the older brother of an otome game's destined villainess, a young man vows to protect his sister Diana. To rewrite her tragic future, he must navigate high society and change their family's fate.

In his new life as Cain, the young noble is determined to prevent the ruinous end awaiting his sister, Diana. Armed with knowledge of the otome game's plot, he focuses on raising her with love to steer her away from the villainess path.

Cain must balance his academic duties, magical training, and aristocratic politics to secure a peaceful future. This heartwarming fantasy follows his dedicated efforts to rewrite their destined tragedy.

Reincarnated as Cain, a noble protects his sister Diana from a tragic otome game fate in Akuyaku Reijo no Ani ni Tensei Shimashita.

Akuyaku Reijo no Ani ni Tensei Shimashita, I Reincarnated as the Villainess Older Brother, Cain, Diana, Otome Game, Reincarnation, Fantasy, Isekai Manga, Aristocracy, Slice of Life