百年前，世界各地皆發生了巨大的地震，導致遠古的遺跡浮出地表，釋放出危險的怪物們。有能力的人們組建了「探險團」來保護百姓。
如今，少女克克蘿加入探險團，舉起了她的機械手臂，隻身踏入遺跡消滅未知的怪物並嘗試找出屬於遺跡的秘密。

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A hundred years ago, massive earthquakes occurred in places around the world, resulting in the surfacing of ancient ruins and the release of dangerous monsters. Those who were capable formed the “Expedition Team” to protect the people. Today, young lady Kokoro joins the Expedition Team. She raises her robotic arm and steps into the Remains to destroy the unknown monsters alone, and tries to find the secret of the Remains.

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