Isekai wa Smartphone to Tomo ni (2017)

After dying by a mistake of God, the protagonist ends up in a parallel world, where he starts his new life. His only possessions are the body God gave him back and a smartphone, which still works in this other world. After meeting several new people and forging new friendships, he begins to discover the secret of this world. He inherits the legacy of an ancient civilization and collaborates with kings of various countries on his carefree journey in this new world.
