高度发展的都市，拉塞尔市。 在讴歌繁荣的这座城市中，动摇这个世界的巨大阴谋开始启动—— 立刻察知阴谋动向的男人索德，为了揭露阴谋而投身于不为人知的战斗当中。但他得到的线索却只有“El Dorado”这样的关键字而已。在战斗当中，索德遇到了一位名叫索菲亚的少女。索菲亚也在寻求着失踪的哥哥皇后留下的讯息“El Dorado”的含义。索菲亚失去了皇后，而索德也有过失去妹妹的过去。被“El Dorado”这一字句所吸引的两人，从对方身上感受到看不见的羁绊，并开始一同行动。 就这样，各自的心意交错的旅程开始了——In a prosperous city named Russell City, an omen that threatens to shake its world begins to move within it. A man named Sword is the first to hear the first stirrings of the plot, and throws himself into a shadow war in order to expose it. His only clue is the key word \"El Dorado.\" He meets Sophie, a woman searching for her missing older brother who has only left her with the same words: \"El Dorado.\" With Sword having also lost his younger sister in the past, both are drawn together by the words, and work together to find out its meaning.
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