Based on the manga series Devilman by Go Nagai, DEVILMAN CRYBABY meets up with sensitive teen Akira (Koki Uchiyama), whose normal life is overturned after he's visited by a mysterious friend from the past, Ryo (Ayumu Murase). Ryo has learned that demons have always existed in the world, but have recently made an evolutionary leap -- they can now hide inside a human body, and are intent on waging war with humanity. Knowing that humans are helpless in the face of the cruel and powerful demons, Ryo presents Akira with a novel idea: He should allow a demon inside him yet keep his humanity intact. And so Akira becomes Devilman, a being with a demon's power but a human soul that's humankind's last chance.