A certain middle-aged man, Saito Kenji installed a mysterious smartphone app \異世界創造のすゝめ\ (Isekai Souzou no Susume, \Guide to Creating Another World\). It was a game in which you could freely manipulate planets, lives, tribes, eras, and all sorts of other things. However, as a result of being transferred to the world on the screen through a new function, he found himself able to travel back and forth to Japan! You can explore and time travel in other worlds, and the different abilities you get can be used either way and use dimensional storage. And you can take things and people with you as much as you want…! “Hmm, this is an adventure you have to have, isn't it? I'm busy resolving problems in two worlds and leveling up in between. Occasionally, he gives an oracle to cause the other world to shake violently, or tames a nine-tailed girl with tuna mayo–? The life of an Ex-salaryman with an “anything goes” God life START!