Kaitou-Saikyou-Zeta
A young man named named Hirakawa Eiji was suddenly killed by God (Kami-sama). In the form of apology, God allow Eiji to be reincarnated into a new world. In that world, it is filled with fantasy, magic and supernatural that can only be found in fairy tales.
In that brand new world, Eiji embark in a journey to find his own place in that world. In that journey, he would learn more about the world, and what he can do. And he won't be remain alone as he used to be.
(A/N: In Another World With My Smartphone is among the first fantasy and harem genre series I know of, so it actually something I like to watch and read.)