Tsukumo no Amanojaku

is a japanese manga series written by Kobayashi Tetsuya. It began serialisation in the February 2011 issue of Manga Time Kirara Forward.

The series was released under 2 volumes from August 2011 to February 2012.

Synopsis
Suddenly, the curse of the Amanojaku makes a horn grow out of Ayaka, a twisted junior high school student. In order to remove this “horn that hurts when you say something different to your true feelings”, withthe help of Nayuta, a genuine Amanojaku she meets in 99's Village, she aims to become a good person. However, will she be left at the mercy of the beautiful demon girls!?

(Source: MU)