悪役令嬢の兄に転生しました

After dying from overwork during a gaming session, a man reincarnates as Cain, a character in an otome game, and becomes obsessed with protecting his adorable younger sister, Diana, from her destined tragic fates as the game’s villainess. Using his knowledge of the game’s scenarios, Cain vows to raise Diana as a refined lady to steer her away from disastrous endings, like being exiled or assassinated. His efforts begin with small victories, such as praising Diana for eating her vegetables, which she proudly shares with him. Cain also starts tackling the game’s darker elements by addressing the hidden issues of other key characters, relying on a loyal orphaned servant for support. These early steps, driven by his unwavering devotion to Diana, lay the foundation for a heartfelt quest to rewrite her future and ensure her happiness. (Unreviewed summary by Grok 3)