Blood Blockade Battlefront (Japanese: 血界戦線, Hepburn: Kekkai Sensen, lit., "Bloodline Battlefront") is a Japanese shōnen manga by Yasuhiro Nightow. It has published bimonthly in the magazine Jump SQ.19 from February to April 2009 and moved to Jump Square upon the former's ending. It follows a young photographer named Leonardo Watch who obtained the All Seeing Eyes at the cost of his sister's eyesight.