Touya Mochizuki, a 15-year old student was accidentally had his life taken by God. As an apology for his mistake God let Touya start a second life in a parallel world. Touya is revived in his former body with some power enhancement and he is allowed to take and use his smartphone in the new world. He comes across various people while making important comrades and before the Hero is aware of it, he has discovered this world's secret. He inherits the legacy of an ancient civilization and he goes around the world nonchalantly while having power that matches that of the kings in this world.