Hiroshi Sakurazaka is a Japanese author and game designer. He is best known for his novel All You Need Is Kill, which was adapted into the 2014 film Edge of Tomorrow. He has also written several other novels, including Slum Online, Brave Story, and The Sky Crawlers. He has also written and designed several video games, including the popular role-playing game Eternal Sonata. Sakurazaka is a highly respected figure in the Japanese literary and gaming communities, and his works have been praised for their unique blend of science fiction and fantasy elements.