Summoned as a teenage hero and returning victorious after defeating The Demon King, Nakamoto Keisuke finds himself back in Japan as a middle school dropout with a seventeen-year gap in his resume. Struggling to find work, he encounters Angelica, a girl from another realm claiming to be his reward. As she vies for his affection alongside a high school girl resembling his lost love, Nakamoto navigates a harem existence entwined with his extraordinary abilities.