Kasumi Shindo maintains the appearance of an ordinary high school student while working as a top-level treasure hunter. His current target is the lost 11th Commandment of Moses. A lead takes him to southern Europe, where he discovers his childhood friend Reina Tachibana is already participating in an archaeological dig at the site. He joins the excavation staff under the cover of a tourist visit. He is not the only person chasing the Commandment, and before he can gain any advantage, he finds himself inside a conspiracy that has no interest in his cover story.