In the tragic timeline of the Fate universe, young Tohsaka Sakura faces a horrifying fate: adoption by the cruel Matou family and a life of torment. Just as despair sets in, a mysterious Life Simulator activates within her mind, offering a chance to alter her destiny through realistic trial runs. However, she is not alone in this endeavor.

Across the dimensional gap, Lin Ye, a transmigrator armed with modern knowledge and a flamethrower, connects to her simulation in a unique co-op mode. While Sakura experiences the simulated trauma and makes critical choices, Lin Ye plays the role of the mysterious savior, executing daring rescue plans from the outside. Together, they navigate the deadly politics of magi families and the looming Holy Grail War.

As they rewrite history one simulation at a time, Sakura gains powerful rewards from her trials, while Lin Ye strives to protect the girl destined to suffer. This is a story of cross-dimensional teamwork, strategic planning, and breaking the chains of fate in a world where magic and modern weaponry collide.