In a world where some people develop special traits, some become ‘hero’, ‘wizard’, or even ‘demon lord’. However, such traits are rare, with most people being simple ‘villagers’. Satou is one of these villagers, just a normal person. One day, a girl posessing the ‘demon lord’ trait takes an interest in him. Ryuugamine Ouka seems to be a calm and good natured girl, but sometimes she’ll casually mutter about destroying mankind. On the other side is Satou’s childhood friend, Hikarigaoka Tsubasa, who has the trait of ‘hero’. With these two opposing forces, and Satou caught in the middle, his school life is set to be anything but boring.