为了保护自己的子民不受伤害，懦弱的国王下令让勇者的后代们踏上讨伐魔王的旅程，能够消灭恶魔王者，即可获得无尽的财富和无上的荣耀。可是，国王并不知道勇者的子孙们究竟是谁，于是，一只多达75人的勇者军团建立了。作为第45号勇者，原本是个废柴的阿鲁巴（下野紘 配音）莫名其妙的背负起了拯救人类的重担，在好友罗斯（中村悠一 配音）的帮助下，对战斗毫无经验的他能够打倒魔王获得最终的胜利吗？
从卡多当中现身的神秘存在亚哈库依·扎修尼纳，试图与人类进行接触。被卡多吸收的真道，接受了亚哈库依·扎修尼纳与人类之间的调停任务。另一方面，日本政府也将国际交涉官徭沙罗花作为代表送往现场。亚哈库依·扎修尼纳究竟是什么人？而他的目标又是什么？
Elya, 20, is a student and a future ecologist. One day, Matvey, the head of a construction company, came to her university to discuss the development plan for an old forest park. Elya did not hesitate to crush his project. Matvey is very interested in girls' confidence, And used his usual influence method - he just tried to ; purchase She, but Elya doesn't need a sponsor. Then, Matvey was surprised by her indestructibility and placed a bet on Elya: romantic seven days according to his rules. If the girl still decides to leave after that, he will refuse to build a skyscraper in the forest park. When Matvey really paused design work, she agreed. Elya thinks she's a bit like the movie 'Beautiful Woman' The female protagonist in, but it turns out that Matvey is not the person she imagined.
