Kurogane Taito, a regular student at Miyasaka High, discovers his life is far from ordinary due to a forgotten promise from 9 years ago. With his lost memories returning, his mundane existence is shattered, leading him into an extraordinary journey. As he unravels the mystery of his stolen memories, a new chapter of his life begins, filled with unexpected twists and a determination to fulfill his promise. Amidst the revelation of his past, Taito embarks on a reverse school fantasy, willing to defy death multiple times for the one he made that fateful promise to.