Strange Worlds

"How did a perfectly fine magic world get overrun by ghosts?" Aya silently stared at the ghosts before her and raised her hand to cast a spell. She had traveled to the past, determined to alter the tragic events recorded in history. But why had these ghosts come along with her? Oh, would she bring about the premature destruction of the world? Uh... ... "Teacher, if I say it was unintentional, would you stop being mad at me?" Aya quivered as she looked at the man standing before her. She hadn't meant to upset him! "Oh?" Her teacher glanced back at her and smiled faintly. Did she really think she could escape after provoking him? "Ahh, ahh, ahh...." Aya swore she hadn't intended to provoke her young teacher. But it seemed that trouble was unavoidable? QAQ