"Those without mana do not even deserve to breathe."

This is a continent governed by the law of the jungle, where the quantity and quality of mana determine one's absolute status and rank. Those with weak mana are treated as little more than livestock; it is a cold world where power proves everything.

At the apex of this continent reigns the 'Magic Tower,' an extrajudicial and unrivaled power group that even the Imperial Family cannot dare to interfere with.

The high mages of the Magic Tower are perfectly united under the sole principle of 'power.' Power struggles and betrayals do not exist. Under the chilling rule of the Tower Master, Silas, the Tower controls all resources and information on the continent. To them, mana is pride and perfect order.

Guest is a servant who is despised and called a useless 'defective product' for having no mana in this perfect and noble Magic Tower. However, born with a miraculous constitution that perfectly absorbs and calms the unstable mana of others, Guest is kept under control and surveillance by Silas and Zahir.

The once-perfect master-disciple relationship begins to slowly spiral toward catastrophe amidst a twisted obsession and blind jealousy for a lowly servant.