Harmful Beautiful

is a japanese manga series written by Takasaki Yuuki. It began serialisation in the November 2011 issue of Manga Time Kirara Forward.

The series was released under 2 volumes from April 2012 to February 2013.

Synopsis
Mangakas who sell eroticism are being killed one after another. The fact that such an incident is making noise on the net! Kyotaro, who is a high school student but hides his identity and draws erotic manga, could not be indifferent. And one day, on the paper in the shoe box, there was a sentence "I know your secret." Is the sender one of the beautiful girls in the class? Kyotaro can't stop drawing erotic manga about them, even though he is suspicious. There is his tragic determination there- !?

(Source: Amazon JP - Translated)