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Demencia overall started off assisting Black Hat's dirty work to be able to impress Black Hat and get him to fall in love with her, a cliché ongoing motive that is still going throughout the series.

In the pilot episode "The Dreadful Dawn", she is given a captive superhero as food from a pit by Dr. Flug before breaking free from her restraints (a straitjacket). Demencia was later sent with Flug and 5.0.5 to Arteno City to defeat the hero Sunblast for Penumbra, who wanted to get rid of him for constantly having the sun burn her skin. Flug goes over his plan to defeat Sunblast, which involves him tracking the hero's location and 5.0.5 covering him, but doesn't involve Demencia at all due to her apparent recklessness; despite this, Demencia disobeys him and proceeds to cause chaos in the city, grabbing the attention of Sunblast. She subsequently attacks him ruthlessly until she accidently gets tranquilized by Flug before Sunblast defeated all of them. Demencia was later scolded by Flug for ruining his intended scheme while she was in a drowsy state.

The three of them returned to Black Hat manor with a new plan, in which Sunblast (who followed them back to the place) gets shrunk into a small size after Demencia brutally attacked the superhero again, under the pretense of believing that Sunblast wanted Black Hat and Penumbra to be a couple. Demencia later ate Sunblast after he tried to escape before Black Hat calls her and the other's performance "mediocre", and proceeds to angrily berate them for bringing a hero to his manor while at the same time turning into a giant monster.