The second volume of the Tasogare Otome × Amnesia manga series covers Chapters 3 to 7, which includes the introduction of Kirie Kanoe and her confrontation with Teiichi Niiya and Yuuko.
Teiichi is being manipulated by Yuuko — a warning spoken by a mysterious girl.
Yuuko is an evil spirit.
Standing behind a trembling Teiichi is Yuuko's disgusting appearance.
The true Yuuko is the form the mysterious girl suggests.