In Another World With My Smartphone (Manga) Vol 01

Due to God having a bit of a clumsy accident, Touya Mochizuki is killed and reincarnated in a medieval fantasy world, along with his smartphone...? His easygoing, wondrous journey through another world starts here! Yen Press
(W) Patora Fuyuhara (A) Soto, Eiji Usatsuka