The Zombies Are Coming, I Have a Sick Sister to Protect Me

[Double heroines + apocalypse + zombies + yandere + strong female + cool writing + slight discomfort + incorrect outlook on life] The first time my sister cut her face was because I said I wanted to leave her. The second time, it was because I wanted to save the person I liked. The third time, she said—— "If even my sister can't protect you, then the world will be destroyed." In a zombie apocalypse, my sister is my only way to survive. It's also a prison that I can't escape from.