When a lightning strike unexpectedly ends his life, 15-year-old Mochizuki Touya awakens before God, who admits to a mistake and offers him a chance at a new life in a fantasy realm. Equipped with his smartphone, Touya embarks on a whimsical adventure in a pseudo-medieval world. Amidst friendships, humor, and sorrow, he navigates through a journey filled with mysteries and chance encounters, all while pursuing his ever-changing desires. Thus commences a grand saga blending swords, magic, and modern technology in a tapestry of unanticipated twists and turns.