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無法破解的數學謎題X拯救世界的偉大使命，不論是推理高手、數學天才，還是密室逃脫玩家，只要翻開第一頁就無法停止！文學獎作家富安陽子首部校園奇幻冒險系列！
地震、颱風、戰爭......自古以來，每當黃泉神打開通往人間的門戶，就會帶來各種毀滅性的災難，唯有找到七名擁有特殊能力的神巫才能與之抗衡。現在，通往異界的大門將再次開啟！
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