Prologue - A Forgotten Scream

 In a quiet classroom in Osaka, the late afternoon sun filtered through the windows, casting warm rays over a group of high school students immersed in the mundane rhythms of life. Among them sat Rein, a quiet boy with dull eyes and a distant aura. He never quite fit in, never quite laughed as hard as the others did. He had dreams-flickers of sand, blood, and a girl's voice crying, "Help me..." Then, the light faded. Without warning, black smoke slithered up from the floor like an ancient beast awakening. A deafening silence fell over the room as time itself warped. One by one, the students disappeared-engulfed by darkness. When Rein opened his eyes, he was no longer in Osaka.