Area D - Inou Ryouiki follows Ryo Inaba, a young boy who obtains a bizarre supernatural ability after a mysterious incident at an abandoned facility, forcing him to become a test subject in a secret government project. The story explores his struggle to survive and understand his power among other individuals with unique abilities, all while uncovering dark conspiracies. Readers enjoy the series for its gritty, psychological tone, creative and often terrifying superpowers, and the moral dilemmas the protagonist faces as he navigates a world where nothing is as it seems.