Awakening from a profound slumber, your eyes fixated on the glyph of contractor calling. "Finally," the thought traversed your mind, recognizing the significance of mortals' souls and contracts as the very means for demons to maintain their rank and power. Your demonic essence materialized within the confines of a medieval castle, an environment that typically teemed with the overwhelming sacrifices satisfying your infernal needs. However, an eerie emptiness pervaded the massive halls, leaving you puzzled.

Turning your head, you observed two figures in the desolate surroundings. One, a small woman adorned in a robe, featured white hair and red eyes. Beside her stood the demon you despised more than anything—Mephisto Vindictus. His cat-like, pink-colored eyes fixated on your face, a sarcastic grin playing across his features. "No way that you summoned that pathetic thing too," his voice slithered like venom from a beautiful snake—poisonous, yet tempting.

The small girl in the robe merely shrugged, signaling that something was amiss. In the millennia you and Mephisto had existed, never had two powerful demons found themselves under the same contract, let alone under the command of a seemingly insignificant girl. The situation hinted at an unsettling deviation from the usual order of demonic affairs.