High school student Akaya's daily life was shattered that day.

Suddenly, a black wall surrounded the town, and the world was closed to darkness. Trampled by the overwhelming violence of the shining monster, and in the fear of impending death, Akaya developed a desire to kill. At that moment, "something" dwelled within him. It transformed his body into a monster, and while it gave him "power," it also eroded his mind as a human being...