Akai Kemono

On that day, the everyday life of high schooler Akaya crumbled. Suddenly, a black wall surrounds the town, encasing them in darkness. Shining monsters attack with overwhelming destructive power. In a last act of desperation, Akaya's urge to kill awakens. In that moment, something appears inside him. It changes him into a monster and grants him power, but gnaws at his humanity... (Source: MU)