For centuries, the world had been torn between the Empire, the Mechanical Utopia, and the Nebulis Sovereignty, the Paradise for Witches. With no end in sight, it seems that the war will continue on for a few more centuries. However, a chance meeting between Iska, the "Successor of Black Steel", and Aliceliese, the "Ice Calamity Witch", changes history. The "Successor of Black Steel" is a peace-loving war nut who only knows how to fight. However, he wishes to end the war with the twin astral swords, white and black, he had inherited from his master. The "Ice Calamity Witch" wants to destroy the Empire and unite the world under the banner of the Nebulis Sovereignty. This story is the tale of the collision of ideals between a young man and a young woman as they try to change the world in their own special ways.
Two nations, the Empire and the Nebulis Sovereignty, have been at war for 100 years. Imprisoned for freeing a witch, Iska is given a chance at freedom. In exchange, he must take down a powerful astral mage known as the "Ice Calamity Witch."
After their brief but fateful encounter, Iska and Alice made an impression on each other, resulting in some sleepless nights. Despite being on the opposing sides of the war, they soon learn that they have much more in common than they thought.
Iska is given a new mission to apprehend the Ice Calamity Witch. By accomplishing the mission, Iska will be a step closer to realizing his dream for a peace treaty. When Iska and Alice meet again, they weren't prepared for what was coming for them.
100 years ago, a drift of astral energy created a vortex which cursed, or gifted, people with astral power. Now another vortex has formed, triggering a race between the Empire and the Nebulis Sovereignty to acquire it.
The members of Unit N07 successfully locate the vortex, but the Sovereignty had already found it. After Mismis is captured, Iska must fight against Kissing, a purebred, to get her back before the Empire attacks the Sovereignty base.
Iska and Mismis survive the eruption of the vortex, but the team doesn't escape unscathed. Meanwhile, Alice decides to go search for Iska in Ein again. They are reunited by fate, but everything is jeopardized when Rin makes a big miscalculation.
Alice is forced to kidnap Iska. Afraid of what will happen to him if word gets out, Alice orders Rin to take them to the Prison Sector to decide their next move. Meanwhile, the members of Unit N07 infiltrate the Sovereignty to get Iska back.
With Risya's help, the Transcendent Demon, Salinger, has escaped from his 30-year imprisonment inside Ollelugan Prison Tower. His unique astral spirit makes him incredibly dangerous to any astral mages, but Alice and Rin must step up and try to stop him.
Iska arrives just in time and battles Salinger, who not only wields multiple astral spirits, but can also combine two contradicting elements together to make his astral art even stronger. Can Iska measure up to him and defeat him?
Unit N07 gets a lucky break; they're given a forced leave of absence for 60 days. They decide to visit a tropical resort to camouflage their attempt to figure out a game plan for Mismis' astral crest. However, fate has something else in store for them.
After their fateful encounter, Sisbell visits Iska at the hotel and asks for his help, ironically offering a similar deal as her sister Alice once did. However, before they can discuss the matter in great lengths, Sisbell is targeted by one of her own.
The Empire's experimental weapon, Object, goes after Sisbell. It also detects Mismis' astral energy. Iska and his team must fight Object to save Sisbell and to stop it from uncovering Mismis' secret. However, it seems Object has gone through an upgrade.
Joining forces with Alice, Iska and his team quash the Empire and the Sovereignty's conspiracy and successfully protect Sisbell. After the ordeal, they travel to Alsamira to enjoy their vacation. However, Sisbell has not returned to the palace yet...
Iska and Alice suddenly meet again at the Riesbaden station. Alice then learns that he is the bodyguard for her sister Sisbell. Meanwhile, a major incident occurs in the central province.
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Alice and Sisbell learn about the attempted assassination of their mother. Alice is worried about her and wants to return to the central province immediately. Meanwhile, an explosion occurs in Riesbaden. The assassin has set their sights on Sisbell.
Alice is back in the central province and reports to her mother about Sisbell's whereabouts. Sisbell herself also returns to the central province a short time later. However, upon her arrival, there is a surprising encounter.
Iska and his team are invited to a vacation house. Alice hurries to stop Sisbell from discovering her secret.
With news of the attack, Alice returns to the Queen's palace. Later they are attacked by an unknown enemy.
Iska must fight Talisman, while Jhin and the others are unable to shake Grugell from their tail.
As the battle between the Saint Disciples and purebreds continue, an atrocious astral spirit approaches…
Alice declares war on Iska in order to put an end to their easy relationship as a friendly rival.
Lady Alice and the queen are up to something.
Iska begins with the plan to infiltrate Hydra's base to rescue Sisbell.
Iska asks his groupmates to leave while he fights the final battle against Mizerhyby.