iko ▁H ara o . ▁The ▁m anga ▁was ▁serial ized ▁in ▁Sh og ak uk an ' s ▁Month ly ▁Sunday ▁Gene - X ▁from ▁its ▁March ▁ 2 0 0 6 ▁issue ▁to ▁the ▁December ▁ 2 0 0 6 ▁issue . ▁It ▁was ▁later ▁released ▁in ▁two ▁tank ō bon ▁format , ▁the ▁first ▁in ▁August ▁ 1 8 , ▁ 2 0 0 6 , ▁and ▁the ▁second ▁on ▁February ▁ 1 9 , ▁ 2 0 0 7 . ▁ ▁Sound tra cks ▁ ▁Two ▁sound tra cks ▁of ▁the ▁an ime ▁series , ▁titled ▁Er go ▁Pro xy ▁O ST ▁op us 0 1 ▁and ▁Er go ▁Pro xy ▁O ST ▁op us 0 2 , ▁have ▁been ▁released ▁by ▁Gene on ▁Entertainment ▁in ▁Japan ▁on ▁May ▁ 2 5 , ▁ 2 0 0 6 ▁and ▁August ▁ 2 5 , ▁ 2 0 0 6 ▁respectively . ▁Both ▁sound tra cks ▁feature ▁compos itions ▁of ▁Y oshi hi ro ▁I ke . ▁The ▁first ▁sound track , ▁op us 0 1 , ▁contains ▁several ▁tracks ▁including ▁the ▁opening ▁and ▁ending ▁them es : ▁" K iri " ▁( by ▁Mon oral ) ▁and ▁" Par ano id ▁Android " ▁( by ▁Radio head ). ▁The ▁second ▁sound track , ▁op us 0 2 , ▁was ▁initially ▁pack aged ▁with ▁a ▁special ▁edition ▁of ▁the ▁first ▁Region ▁ 1 ▁DVD . ▁ ▁Re ception ▁Er go ▁Pro xy ▁received ▁mostly ▁positive ▁reviews , ▁with ▁critics ▁pra