When a former demon king and a former hero are reincarnated in a peaceful world, they accidentally begin to fall in love! Narukami Ryusei is a NEET by profession. He spends his days hiding and playing video games, but he was actually a demon king in a world other than this one. Here, the hero who once defeated Ryuusei and is now a high school girl, Hanaori Mitya, arrives to visit him....