The opening episode tells you exactly who the killer is, then spends the rest of the season proving you don't understand anything. Nana walks into a school full of superhumans with nothing but a smile and a plan to systematically destroy them, and the show asks you to root for her anyway. Every episode peels back another layer of her method, her justification, her humanity, until you're not sure if you're watching a thriller or a confession.

Monsters known as the Enemies of Humanity have attacked the Earth, and to fight them, teenagers with supernatural gifts called Talents train at an academy on a remote island. These Talented students have powers that break the rules of reality, from pyrokinesis to time travel. Among them is an outlier with no ability whatsoever, a protagonist who sets out to wipe out the Enemies of Humanity through intellect and manipulation. When two transfer students, the enigmatic Kyouya Onodera and the mind-reading Nana Hiiragi, join the class, students soon begin vanishing. The result is a psychological, supernatural suspense thriller built on mystery and horror.