One day, a door suddenly appears in the protagonist’s room, and when he enters it, he discovers that he is entering another world. The protagonist tries to make money by going back and forth between the present world and the other world. However, the protagonist, who comes to the other world with the senses of a modern person seems to be a weird person from the perspective of another world’s people. While being puzzled in various ways, the protagonist’s worked hard in both the present age and in a different world, a misunderstanding-based upstart fantasy.