The black history notebook of my middle school days was sent from my parents’ home. While being nostalgic, as if I had made a proper magic circle, I summoned the Hero from another world. “–Who are you, an underling of the Demon King?” A story of struggling to return the hero who was summoned by mistake by a 25-year-old OL who should have completely cured her chuunibyou disease. Note : OL (オーエル) stands for Office Lady ( オフィスレディー), a japanese slang for female office worker (in Japan) who performs generally pink-collar tasks such as secretarial or clerical work. Office ladies are usually full-time permanent staff, although the jobs they perform usually have relatively little opportunity for promotion, and there is usually the tacit expectation that they leave their jobs once they get married.