Cecil, a hybrid born from the union of a human and a magical creature, was born in a laboratory in the Kingdom of Marshall.
Deprived of parental love and subject to monstrous experiments, he became deviant.
Armed with his terrifying abilities, he killed all the researchers and escaped to the Kingdom of Calvard located on the continent of Midgard.
After about three years of living as a thief, he was caught by the Knights and thrown into a cell.
After a while, he was taken in by Delas, the renowned sage of Midgard, and raised as a son along with Delas' favorite daughter, Sphia.

Time flies, and Cecil plans to propose to Sphia as soon as he comes of age.
Yet, the allied nation betrays them, plunging the Kingdom of Calvard into war.
Of course, Cecil fights tooth and nail for his country and to protect his beloved Sphia, but Garland, the enemy nation with its overwhelming military might, proves unstoppable.
They execute both Delas and Cecil's beloved Sphia.
Not only that, but before her execution, Sphia is driven insane by a merciless rape.
When Cecil learns of this, his hatred is immeasurable.
The power of the demon king's seed awakens inside him, and dark magic bursts out.
Before he realizes it, Cecil single-handedly incinerates a thousand Garland soldiers.
Cecil, not staying in one place for long, continues his life as a mercenary.
Attracted by the generous offer of the Kingdom of Keltura he later joins their forces.
To sate his bloodlust and in order to gain fame, he rushes to the front lines whenever war breaks out.

Years later, having been promoted to general for his role in the conquest of the Kingdom of Lindegard, Cecil is appointed supreme commander of the continent of Mitras.
As he continues to indulge his desires, can Cecil ever find love again?..

[Translated from getchu]