29-year-old Takashi Koizumi is a corporate vulture with no sympathy for the clients and businesses that he puts through hardship. Funnily enough, he dies in the least dignified way possible: slipping on a banana peel!
When he awakes, he encounters a famous businessman named Mister Jackson who offers him a chance to “reset” his soul and be accepted into heaven -- all Takashi has to do is get through the “Dungeon of Purification”! Turns out Takashi is suited to be a summoner, but the only monster he manages to summon is the level 1 female goblin, Gobumi! Will they really survive this dungeon!?