Okazaki Kei

Sena, a high school boy, wakes up in an empty green room. In front of him was a world map and a one-line explanation. "Think of what you want and press the button for the country you want to destroy. You will be released if you win.'' Sena, who is gradually cornered, finally presses the button. Will it be Sena or humanity that will survive in the end?

The story centers around Nyaruko, a formless Cthulhu deity of Chaos (Nyarlathotep) who can take on the shape of a seemingly ordinary silver-haired girl. Mahiro Yasaka is a normal high school boy who is being chased by a fearsome black alien one night, until Nyaruko saves him. She explains that the creatures from H. P. Lovecraft’s works are actually races of aliens, and that she has been sent to Earth to protect him from being kidnapped by an alien trafficker. Eventually, Nyaruko and two other Lovecraft-creatures, Cthugha and Hastur, ends up being freeloaders at Mahiro’s place.