Using the unique skill <Otherworld Travel (Moon Gate)> that only I can use, I aim to live a rich slow life! The protagonist, Allen, is reincarnated in another world and one day realizes that he has the unique skill <Otherworld Travel (Moon Gate)> that only he can use. Using this power, Allen travels between Japan and the other world, making money by selling various items to entertainment-hungry people from the other world, as well as people who have been transferred or reincarnated. In the meantime, he makes the acquaintance of the daughter of a large corporation and the princess of a kingdom in the other world, and enjoys the other world to the fullest...!!