As a typical high school student, Saiga Junki generally displays a level of apathy. However, he excels academically, surpassing the average standards. After his archaeologist father loses his life while investigating ruins, Junki and his family embark on a journey to the excavation site. Here, Junki has an encounter with an enigmatic individual who presents him with a valuable heirloom - an ancient artifact that his father specifically left for him.