Awakening in a World After the End of an Old Civilization

With only her consciousness remaining and most of her memories lost, someone makes a contract with a girl and regains a body as her contracted Resonance Beast.

Taking the name Ston, this consciousness sets off with the girl Rui on the path to becoming the strongest Resonance Master.

In this new civilization, brimming with magical power, Ston and Rui write a tale of the bond between them!