The Zanatos are heroes of lore, honored and revered by the inhabitants of Tenkai Island. Herata Sigma, following in the footsteps of his father, has trained and dedicated his life to becoming a Zanatos. While enduring the grueling 'selection process' to join the Zanatos, he discovers the mysterious demon Xahakku has cursed his family's bloodline and his life takes an unexpected turn. Guided only by his desire to learn the truth of his father's death as well as unearthing the dark secrets of the Sigma family name and the Zanatos, Herata embarks on a dark adventure chasing a dream that may have been already lost at the start.