Spring. At the Sacred Beast Contract Academy, the world's premier institution for training summoners, the entrance ceremony for new students was underway. Geniuses gathered from nations across the globe filled the grand hall, each carrying their own expectations and dreams. The finale of the ceremony was the Contract Ritual, which all new students must undergo. As the colossal summoning circle shone, one after another, summoned beasts materialized. "An A-rank!" "It's the divine bird, Frost Phoenix!" "Her Highness the Princess has contracted the flame dragon, Crimson Dragon!" The hall was wrapped in cheers. And then, at last, it was the protagonist's turn. With the eyes of the entire academy upon him, the protagonist stepped forward into the summoning circle. The instructor quietly announced: "The Contract Ritual will now commence." The magic circle blazed brilliantly—yet nothing appeared. Confusion and murmurs spread through the hall. "...Is it a failure?" At that moment. Covering the entire floor, a massive, never-before-seen magic circle of pure white and gold unfolded. The air trembled, and the world itself held its breath. Slowly emerging from the light was a beautiful girl with long, silvery-white hair and golden eyes. An Origin primordial summoned beast, existing only in myth—Zeros. In the silenced hall, she gazed directly at the protagonist and smiled gently. "...I have finally found you." "My one and only contractor." Simultaneously with those words, a dazzling light enveloped the two, and a contract with the primordial summoned beast—one no one else had ever been able to form—was established. The first contract with an Origin in the academy's history, and the first since the age of myth. On that day, the protagonist overturned the world's common sense and became an existence that would move the fate of Astradia.