表面上，高岭清麿（樱井孝宏 配音）是一个个性孤僻不爱上学的不良少年，但他其实是个拥有超高智商的天才少年。某日，一个外表奇特的男孩找到了清麿，男孩告诉清麿自己叫卡修（大谷育江 配音），此行前来的目的是为了报恩。就这样，清麿收留了卡修，两人的同居生活正式开始。 在卡修随身携带的红书里，隐藏了卡修失忆的线索，而清麿居然轻易的就读懂了上面古怪的文字，从而展开了一段魔幻奇缘。原来，在这个世界上，存在着很多像卡修这样带着魔法书的孩子们，在他们之间，以破坏其余的魔法书为目的，持续着一场浩荡的战争。而卡修和清麿，亦被卷入了这场残酷的战争中去。
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