Metamorcode  

Metamorphic Code, メタモルコード

There's been a series of unexplained deaths where victims are torn apart without any apparent reason. One day, things escalate when Homura Keis computer class of 36 people is brutally murdered. Due to her delinquent behavior in missing classes, Kei survives as the lone survivor. When she returns home that night, a hacker named Yuon appears at her doorstep. He claims to have also lost someone due to the same mysterious killer and has information that Kei does not possess. Apparently, there's a program that can manipulate humans through the image of a blue butterfly on a computer screen, which is being used to murder people. Now, Kei and Yuon must work together to find the killer before they become the next victims!