Steel Lady Nanase

Steel Lady Nanase is an urban legend of the vengeful spirit that haunts the Makurazaka town, based on the untimely death of idol Karin Nanase. [spoiler]She is later revealed actually not the ghost of Karin Nanase, but in fact, an imaginary creature created by Rikka Sakuragawa's powers.[/spoiler] (Source: Kyokou Suiri Wiki)