故事发生在一间名为“燕雀”的侦探社之中，坐镇其中的，是名为洛基（樱井孝宏 配音）的美少年侦探。虽然表面上看来只是一个小孩子，但洛基的真身其实是北欧神话中的邪神，因为作恶多端而被放逐人间，在此期间陪伴着洛基，照料他饮食起居的，是原型为一条巨蟒的暗野龙介（三木真一郎 配音）。

　　一次偶然中，一个名为大堂寺茧良（堀江由衣 配音）在无意之间闯入了燕雀侦探社之中，她希望洛基能够帮助她替一个会说话的洋娃娃找到曾经的主人。一番波折之后，事件总算顺利解决，而在此之后，茧良竟然自说自话地成为了洛基的助手，两人一同面对的，是各式各样科学难以解释的灵异事件。

At first glance, Serro Azul may seem like just another typical inland town, quiet and surrounded by mountains, where technological advances such as internet and cell phones have not yet arrived. A place where anyone who passes does not pay much attention, not knowing what is missing, after all, a city that is near Greenville and Tubiacanga could not fail to have its peculiarities. The main one is a source with curative and rejuvenating properties, which is the outermost part of a gigantic aquifer, a huge reservoir of what is becoming the most precious possession of the Earth: water. This source is protected by seven guardians whose mission is to ensure that this wealth does not reach the wrong hands.

一对原本青梅竹马的男女却因一场车祸彼此错过，多年后重逢之时却成为异父异母的姐弟。两人从相互试探到极限拉扯，在爱情与可能存在的世仇中纠缠挣扎。抽丝剥茧之后，携手揭露了那场车祸的真相，有情人终成眷属。