Twenty-year-old Takashi Yamagata was forcibly summoned to the world of Luminos, where he spent five grueling years surviving near-death encounters to defeat the Demon Lord Bala. While most "destined heroes" embrace their new lives, Takashi’s only goal has always been to return to his original home. However, after fulfilling his duty, he discovers that the King and Princess Victoria Nightingale never intended to honor their promise to send him back.