This summary made me smile.
A Character Summary:
"Nano kills shitloads of people. Shiki regularly commits genocide. Yandere!Keisuke loves bloody massacres. Kiriwar and Gunji are sadistic bastards who like to violently slash/beat people to death. Takeru has his stint with 50% Line. Rin takes gross pictures of dead people. And the series as a whole boils down to a Battle Royale style tournament in lawless post-apocalyptic Tokyo." - Endoh_Miku
Studio Prediction:
A-1 Picture (40%)
Studio Deen (40%)
Mad House (10%)
Others (8%)
Bones (2%)
[Rumor: Studio Pierrot]
Source
Comments: Unsure of Studio Deen, I'm not too happy with their recent line of works. Hopefully... not!