The horror story is a Spinoff of Magical Girl Apocalypse
On the pages of the newest issue of Akita Shoten´s Weekly SHounen Champion it has been revealed that the Anime adaptation of the manga “Magical Girl Site” will premier this April. Tadahito Mitsubayashi (Tokyo Ghoul:Pinto) is directing the Anime at Production doa; Takayo Ikami (Beutiful Bones- Sakurako Investigation) is in charge of the series scripts.
Wikipedia describes the story as follows:
“Asagiri Aya is a middle school girl who has problems both at school with bullying, and at home from physical abuse by her brother. While browsing online, a website pops up on her computer featuring a creepy looking person. This person appears to take pity on her, and announces that she has granted Asagiri magical powers. Later at school she is cornered by bullies, and with nothing to lose fires a gun that had mysteriously appeared in her locker earlier that day at them. The shot causes the bullies to disappear, but to her horror she finds out that they somehow had been hit by a train nearby. Asagiri feels as though she had killed them somehow, and is confused to find herself with longer red hair with eyes that flow blood. She later finds that she is not alone when a classmate reveals that she is also a magical girl. Asagiri learns about magical girls, and the power she has acquired from her new friend who has offered to help her. The two girls though can’t explain why there is something that looks like a countdown clock on the website, and fear it might be something bad.”
Via: Anime News Network