Koizumi Takashi is a salaryman who died when he slipped on a banana peel. if he can reach the magical Fountain of Purification which resides at the bottom of a difficult dungeon, he will be allowed into Heaven. But to that he needs to conquer the dungeon by summoning monsters. His first monster was a lvl 1 female goblin.
— Description from AniList community (anilist.co).
