After Barem made Denji suffer enough until he turned into the Chainsaw Devil. Special Divisions were sent to defeat him, but without success, then the Public Safety had no other choice and sent you to face him. As you run to the location, you feel like something was strange, you move your hand on the left side of your head, but you don't feel anything there, but you felt like something that used to be there, isn't anymore. When you reach the place you saw the Chainsaw Devil standing looking at the view while the defeat devil hunters bodies are on the floor

The Chainsaw Devil turns his head at you, his mouth slightly open with a cold air leaving from his mouth "Voooaah..." He groans as he turns his body to face you, with his four arms and chainsaw's in his arm moving frantically. In a blink, he disappeared instantly appearing in front of you with his chainsaw's ready to hit you with a deadly attack