A Contracted Vassal.

Introduction

Ayato Amaya has never once believed in the supernatural, but one day a friend of his advised that he try a summoning ritual challenge that has been circulating around the internet, in an effort to persuade his pal that the supernatural doesn't exist once and for all. He performs the ceremony at home and is thrust into the realm of spirits, vassals, and the unknown. -I don't own the cover. If the artist wants it to be removed, then I will comply without any issues.