月臣学院高等部一年级的鸣海步（铃村健一 配音）拥有着极高的智商和缜密的推理能力，但即使是这样，小时候的他也一直都生活在哥哥鸣海清（井上和彦 配音）的阴影里。令他意想不到的是，两年前的某天，哥哥留下了“诅咒之子”的讯息后神秘失踪了。对于哥哥的失踪，鸣海步一直都耿耿于怀，他既想得知一直敬仰的哥哥的下落，又想弄清楚哥哥一直痴迷于研究的所谓的“诅咒之子”和“不为人知的真相”究竟是什么。鸣海步结识了学姐结崎雏乃（浅野真澄 配音），后者在校园中的巨大情报网络为鸣海步的追踪提供了便利。随着调查的发展，一个足以颠覆鸣海步的世界的真相渐渐地浮出了水面。
动画片改编自漫画家城平京的同名漫画，该作因其轻松的校园风格和严谨的推理在读者中积累了巨大的人气。
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