P.S. I looked the info of this doujinshi on doujinantena.com:
GEARS of R 原作:Gears of War サークル:Stoic Romance
Also, I searched in this page the circle "Stoic Romance", and the only artist related with that group is Ariga Tou. So, I think the full title would be: [Stoic Romance (Ariga Tou)] GEARS of R (Gears of War)
Although, I don't know if this doujinshi was published in digital form or in a convention on printed form. And one last thing: Myrrah is 乇乂ㄒ尺卂 ㄒ卄丨匚匚!