Isekai Souzou No Susume ~Smartphone App De Wakusei Wo Tsukkushiteshimatta Ore Wa Kami Tonari Sekai Wo Meguru~ (Associated Names)

A certain middle-aged man, Saito Kenji installed a mysterious smartphone app “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…