Kamitsubaki-shi Kensetsuchuu.

Seven years after a catastrophe shattered human civilization, Kamitsubaki City has risen as a beacon of science and prosperity. Beneath that recovery, however, lurk creatures known as Tesseractors, monsters born from the darkness within human hearts and capable of tearing apart the fragile peace the city has rebuilt.

Standing against them are five girls whose voices can wield magic. Through song, they turn emotion into power, fighting not only to destroy the creatures but also to mend the wounds the disaster left behind. As the mysteries surrounding Kamitsubaki deepen, protecting the city means confronting the human darkness from which its enemies are born.