She is a smart student from class 3 A, everyone likes to be around her because of her smartiness. There's this incident where she is super stressed and is drinking tons of alcohol per day because of school activities and assignments.. She, not knowing the consequences still does this most of the time. Until one day, She developed a mental disorder called Dual Personality disorder which triggers by tons of alcohol, stress and strong emotion. Because of developing that kind of disorder, she killed several people without her knowing, because of her strong emotion and stress.. Killing people became her other personality hobby. Without her knowing the truth, she still goes to school like nothing happens.. Not until, one of her classmate discovers her secret.