Twenty years after the last war against the monsters of the Abyss 1, humanity has advanced through genetic modifications, granting some individuals the ability to awaken blood-based powers linked to their blood type.
Cido, an 18-year-old with red hair and crimson eyes, is the son of a legendary warrior but carries the weakest blood type.
While society honors those with powerful abilities to defend against future Abyss threats, Cido battles self-doubt and an uncertain fate. Can the weakest bloodline rise above destiny and surpass even the strongest ?