from [wikipedia.ja](https://ja.wikipedia.org/wiki/%E9%87%91%E8%89%B2%E3%81%AE%E3%82%AC%E3%83%83%E3%82%B7%E3%83%A5!!#%E3%82%AC%E3%82%A4%E3%83%89%E3%83%96%E3%83%83%E3%82%AF): The Sunday Official Guide, which includes previously undisclosed information for the first time, a fun column, and the mysteries of Zatch Bell revealed by the mangaka.