I Was Reincarnated in an Otome Game and Became the Butler of the Main Character [Heroine]. Before I Knew It, the Heroine Had Become a Yandere.

Native title: 乙女ゲーに転生した俺が主人公【ヒロイン】の執事になった。主人公はいつのまにかヤンデレ化していた件について。