Touya Mochizuki, a fifteen-year-old accidentally killed by God, is sent to a fantasy world as an apology, with enhanced physical abilities and a smartphone that still works. In the Kingdom of Belfast, he teams up with the twin adventurers Elze and Linze and soon catches the attention of Princess Yumina. Between guild quests and chance encounters, Touya discovers his phone can amplify his aptitude for every school of magic, making him overpowered from the start.