There is no freedom in this world. Here, where the sun cannot reach.

Ten years after the Caligian invasion of Hemeria, Kouma Fujikawa sets out on a journey to find Zeta, the Caligian Queen's guard that saved his life, after she mysteriously disappeared, leaving a note telling him to come and find her. With Zeta’s weapon and companion, Shi-oN by his side, he joins a resistance group called the Helios:/Resurgence to hopefully pick up clues on her whereabouts and possibly free the human race from the suffocating grip of the Caligians government.