Is Duan Nao hentai?

ONA · 2014 · 16 episodes · R - 17+ (violence & profanity)

Mystery, Sci-Fi, Suspense

The word cerebrum refers to a gigantic system consisting of collision universes, which is called cerebrum universe. The story starts from a series of unknown murders, unravelling the secret hiding beneath the entire universe, ranging from horrifying conspiracies to galaxy wars, from anti-human betrayals to honourable sacrifices. Having realised her weakness and backwardness, mankind takes the last stand. (Source: Official website)