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A Crystal Disk is an item that is given to the students of the Crystal Seminar. It was said to enhance skills and intelligence. However, it would actually brainwash and steal energy from the students who used it. This item appeared in the anime and in the manga.

Trivia

  • In the manga and original anime, it was originally a floppy disk but it was changed to a CD in the re-release and in Crystal.

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