Újraéledt démonok és zavarodott emberiség világában az érzékeny démonfiú egy kegyetlen, elfajult háborúba kerül a gonosz ellen rejtélyes barátja, Ryo miatt.
Determined to protect his demon world from heavenly angels, demon Masatora Akutsu heads to earth in search of a charismatic human to rally his kin. Masquerading as a high schooler for his recruitment mission, he's captivated by the lovely Lily Amane. But he's in for a wild celestial surprise, because she's his archnemesis—an angel—and she's set on reforming his demonic ways!
A new guardian "angelus" uncovers a secret behind the Angelus System's bureaucracy that leads him to break its official rules about protecting humans.