Extra Existenceエクストラ・イグジステンス ; 崩毁年代记

From SBM's translation of chapter 1: "13 years ago, an unknown object appeared at Shinjuku. That creature regularly gives birth to a demon. Therefore, our world is being eaten clean." The military found a weapon capable of fighting these creatures, a special power known as "exex" that becomes part of the human body. From the author of Ubel Blatt.