In the middle of the first semester, a new transfer student introduces himself to the rest of the class. Serizawa Naoya, a first year high school student meets new faces in his new school. However, studying, making friends and other activities that a normal high school student is usually engaged in are the last thing in his mind as he locked eyes with Nagano Rika, the quiet girl sitting in the corner of the room.  After all, him enrolling as a student is nothing but a facade to achieve his true goal. Witches have existed through generations, hiding behind famous companies and rich family names. They have infested the unknowing humanity, manipulating the world behind the scenes using their demonic powers for one common goal. That's where witch hunters come in—The only group of people left that is aware of the existence of the supernatural. They use underhanded tactics and strategies to assassinate the seemingly undefeatable entities. Serizawa Naoya, at age 15 is currently under an operation as an active witch hunter: Get close to Nagano Rika, and sabotage her entire demonic bloodline.