Nyizel Vernimières only saw the world in two colours: black and crimson. His life changes when he spares the human girl that was a target. Upon leaving the shadows of the underworld behind him, Nyizel starts a new chapter in his life with her. Throughout his time together, he learns the world has more to offer than just two shades of colour.

Settling down in the borderland region of Nullus, Nyizel lives a peaceful and quiet mundane lifestyle as an apothecary in the countryside. While Nyizel is skilled in various crafts, he wishes to marry the girl whom he spared from a grim and certain death.