In every corner of the world has been explored, the only remaining secret-the big cave "Abis". I do not know where to continue, bottomless huge longitudinal caves, inhabited by wonderful and strange creatures, sleeping with precious relics that human beings cannot make today. The incredible gesture of Abis attracts people and drives people to take risks. In this way, adventurers who have challenged the big caves for many times have successively gained the name of "cave explorers." Rico, an orphan who lives in Oz, a town built on the edge of Abis, dreams of one day becoming a great cave hunter like her mother and solving the mysteries of Abis. One day, with the discovery of her mother Lesa's white flute as an opportunity, Li Ke decided to sneak into the depths of Abis. Reg, the memory-losing robot picked up by Li Ke, also decided to go with him in order to find his own memory. Li Ke was poisoned by the bullet-piercing beast on the fourth floor of the deep realm. The one who saved Rico was Nanaki, the human remains. Nanaki also became a companion of the two, and their adventures headed for the five layers of the deep world where Podolto was located. There, they met a girl who called herself Prussika.
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