An ordinary salaryman is recruited by the Demon King to become one of his Four Heavenly Kings in another world. What could possibly go wrong? Uchimura Dennosuke is just an ordinary Japanese salaryman, until he's sent to work in Vietnam where he dies in a hit-and-run accident. Uchimura is reincarnated and summoned to another world by the Demon King, who offers him a new job - as one of the Four Heavenly Kings of his army! Uchimura is faced with an offer he can't refuse, but can he do the job?