In the depths of the vast universe, a star field composed of mysterious "resonance crystals" - the "Crystal Soul Holy Land", contains the most original energy and consciousness of the universe. This is the cradle of the civilization of "resonators". They resonate with the crystal with their hearts and souls, understand the rhythm of the universe, and pursue the transcendent state of unity of body and mind. However, the "Iron Maker" empire on the other side of the star sea believed in the ultimate mechanical and material power. They coveted the pure energy of crystals and pressed their armies on the border in an attempt to "purify" the Holy Land through war.
