Chaos Machina is the first antagonist that appears in the anime Cautious Hero.
Demon Lord discovered that a new hero was being summoned, so he sent Chaos Demon to finish him off. She then suspects that he would go to a harmless world with weak monsters, she then goes there. She realizes that he will be a threat so she decides to kill him right there, but Seiya runs away from her, along with the goddess Ristarte while Chaos Machina chases them. After that, she heads to a nearby village and takes control, she cuts off village's head every ten minutes and laughs wildly. However, afterwards when she realizes that Seiya is more powerful, he then goes to face her. She goes into her demonic but strong for incinerates the whole village, but she underestimated Seiya who kills her by cutting her into pieces.