極限深度兩萬米以上?!
在人類最後未曾涉足的深淵裡究竟有什麼……？
在每個角落都被探索完畢的世界上，有個唯一還未涉足過的秘境——巨大洞穴「深淵」。在這個不知通往何處的深大洞穴內，棲息著各種奇妙奇怪的生物，沉睡著當今人類所無法製作的貴重遺物。
深淵那充滿不可思議的姿態令人們為其神魂顛倒，並開始了冒險。而屢次挑戰深淵的冒險家們後來被人們成為「探窟家」。
莉可是一名孤兒，在深淵邊上的城鎮「奧斯」居住，夢想著有朝一日成為像母親一樣偉大的探窟家，解開深淵的謎團。某一天，莉可在探窟的時候，撿到了一個少年形態的機器人……？
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