传说，天堂、人间、地狱三地之间融入在一起的血液叫做希望之子，能喝到希望之子的人能得到永恒的生命，挥霍不尽的财宝，将成为世界之最。十七世纪初，玛里卡拉王族的考里路以为占领西西里自治区的卡鲁帝猫族的族长卡天娜意图隐藏'希望之子'而战争。这场荒谬的大战终于在十八世纪初结束画上句号。患上了名叫"希望"疾病的玛蒂尔收到了一封来自谜样学院的邀请函，为了寻找疾病的真相，厌恶王族的她踏上了王族特工队！除了保护人类之外，同样身负消灭即将复活的考里路的决心。（It is said that anyone who drinks the Son of Hope, a blood mixture from the heaven, man's world and hell, could become immortal in life and wealth and the top power of the world. In early 17th century, Kaliru of the royal blood of Maricana started a war with Katina, the matriarch of Caruti Cats that occupying the Sicily Region, for the latter's intention to hide the Son of Hope. This absurd war finally ended at early 18th century. Martel, who is suffering from the disease named "Hope", receives an invitation letter from the Mysterious College. In order to find the truth about this disease, this royal hater joins the royal special force! Except for saving human, she is decisively shouldering the task of wiping out the awakening Kaliru.）