Hikkatsu! Strike a Blow to Vivify(ヒッカツ!) is a Japanese shōnen science fiction comedy manga by Yu Yagami(矢上 裕), the author of Those Who Hunt Elves. It was published in Japan by MediaWorks in the monthly manga magazine Dengeki Comic Gao! from May 27, 2005 to May 27, 2006 and collected in three bound volumes. It is licensed in North America by Go! Comi, with all three volumes released.