Salaryman ga Isekai ni Ittara Shitennou ni Natta Hanashi

Dennosuke Uchimura is a simple Salaryman, who one day is run over by an elderly lady on a scooter and left in the street to die. When he regained consciousness he discovers he was summoned to another world by the Demon King himself, who offers him a position as one of his Four Heavenly Kings.