As the deadly virus Medusa ravages the world, a select few are chosen to enter a frozen slumber in hopes of a cure. Among them is Kasumi, a young girl yearning to reunite with her infected twin sister, Shizuku. Awakening from their long sleep in the Cold Sleep Capsule Center within an ancient castle, Kasumi and the others find themselves in a changed world. Encountering a castle overrun by thorns and under siege by mysterious creatures, reminiscent of 'Sleeping Beauty,' they face a new reality filled with peril and unanswered questions. How long were they dormant? What spawned these monsters? The survivors, left adrift in this puzzle, embark on a thrilling journey of discovery.