- 出版社：Union Square Kids
- 出版年月：2022年 10月
- ISBN：9781454946366
- 装丁：PAP
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装丁について
- 言語：ENG
- 巻数・ページ数：224 p.
- DDC分類：[Fic]
- 内容紹介：
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Billy and his friends are transported to a distant future where the evil Dragon of Death rules Dragon City and humans live to serve the dragon population, but they are determined to find their dragons, defeat the Dragon of Death, and return home.