Saiai no Onee-sama ga Akuyaku Reijou datta no de, Kami ga Sadameta Scenario ni Aragaimasu @COMIC

"I will shatter the fate standing in my sister's path!" Driven by an unwavering devotion, a younger sister harbors boundless adoration for her older sibling—a woman destined to be cast as the villainess of their world. When the cruel trajectory of their story threatens to lead her beloved sister toward a tragic demise, the younger sibling refuses to accept such a heartbreaking conclusion. Casting aside all concern for appearances or societal judgment, she boldly steps forward to challenge the very narrative that condemns the person she loves most. Armed with nothing but profound affection and relentless determination, she embarks on a vibrant time-looping journey to rewrite history. Each cycle offers a new opportunity to defy the divine scenario meticulously laid out by the gods, transforming her desperate struggle into a testament of pure familial love. This energetic fantasy chronicles her tireless efforts across the boundaries of time itself, proving that even a preordained tragedy can be undone when fueled by absolute persistence and an unbreakable bond between sisters.