月落和亚晨是一对双胞胎兄妹，他们在一个与世隔绝的深山小村落里出生，被称为“分隔夜与昼的双子”。他们拥有获得特殊力量的资格，一场围绕他们的双使战斗也随之展开。 双使是一种成对的存在，被人类冠以“幽灵”、“怪物”、“怪兽”或“异形”等各种各样的称呼。它们并非人人可见，各自拥有不同的外表、性格和能力。每对双使都有一个与之缔结契约的主子，而指挥它们的主子被称为“双使师”。 许多大人在双胞兄妹开始懂事前就暗中操纵，试图夺取他们的力量，因此月落和亚晨在年幼时就被迫分离。本作故事以兄妹俩的重逢展开序幕。
距离“天人五衰”企图的消灭国家的计划还剩6天。 在那之前，能夺走他们手中的“页”，能打倒还没见过的首领·神威吗? “这就是你的生存之路么……” 幕后黑手的真面目终于揭开。 朋友对朋友，过去和现在。一切，都是为了未来一一
作品以日本著名推理小说家江户川乱步的诸多名作为原案，将乱步的幻想世界观与现代的舞台相结合。动画讲述在某所中学发生了教师被杀事件。就读于这所学校的少年小林，与前来搜查事件的天才侦探明智相遇。对于只搜查异常犯罪的明智感兴趣的小林，不顾朋友羽柴的反对，自愿成为其“助手”。在接连发生的奇怪事件当中，小林很快和明智展开了调查。
Adam's older brother was killed in a car crash a year ago. His family has not been the same since. As his parents struggle to cope with their grief, Adam (10), plagued with guilt over his brother's death feels he is all alone in the world. But everything changes the day he meets Abulele. The Abulele are ancient monsters, bear-sized. Local legends tell that they are extremely dangerous, but in fact, they turn out to be quite friendly and playful creatures. Abulele quickly becomes Adam's best and most secret friend. Together, they outsmart Adam's mean schoolteacher and beat the class bullies. But Adam's parents start to suspect he is harboring a secret, And when a government, Special Forces unit called "Thunder" appears in the neighborhood on a mission to capture Abulele things go from bad to worse. In order to save his best friend, Adam will have to get Abulele back home to its family, and to do so, he will need to put the past behind him and realize that when you truly love someone, ...
