Senki Survival Saga: Isekai no Unmei wo Kaketa Mujintou Fujun Iseikouyuu

Anastasia, an elf recognized as the greatest magical talent in a millennium, is engaged in the decisive battle of a conflict involving three factions. During combat against her demonic adversaries, she is engulfed by a bright light and awakens on a deserted island in a different world. As she navigates the island, Anastasia encounters an enigmatic individual and discovers she can no longer use her magic. The story follows her survival efforts on the island alongside a regular man.