Death March to the Parallel World Rhapsody

デスマーチからはじまる異世界狂想曲

The story of the light novel series and manga follows a 29-year-old programmer who is on a "death march," but one day he wakes up in another world after a nap. From a meteor shower he happens to gain vast riches, and he decides to go sightseeing. So begins his "heartwarming, occasionally serious, and harem" adventure in another world. (Source: Anime News Network)