Borrow a book from libraries around the country with 
demons
Setsuna Mudou is a teenager in Tokyo with a lot of unusual problems. First, he’s in love with his sister Sara--like real love love--and as if that weren’t enough, he’s also the latest reincarnation of the cursed female angel Alexiel, who rebelled against Heaven and defied God. When his powers start to awaken he’s approached by Kurai, a demon princess of Gehenna who was Alexiel’s follower, hunted by Alexiel’s insane twin brother Rosiel and his puppets, and viewed as a savior by an underground faction in Heaven.
The Space Between is another stand-alone novel by Brenna Yovanoff. This novel follows two protagonists—Daphne, the daughter of Lilith and Lucifer, and Truman, a human boy.
The year is 2018 and demons have taken over Atlanta, GA as well as the rest of the world. Demon Trappers are hard at work in cities all over the world keeping demons from causing any more disruption than necessary to the humans who are struggling to get by in their daily lives since the economic upheaval of the recent past and the incursion of demons from hell. Riley Blackthorne, daughter of famous demon trapper Paul Blackthorne, is the first and only female dem
Kuroshitsuji, or Black Butler, is a manga composed of one part serious historical fiction, one part supernatural horror, one part fanservice, and five parts uncut crack.
Although a sequel to The Drowning City, The Bone Palace stands alone quite well. It's a dark, political, high fantasy mystery told from two perspectives: Crown Investigator and necromancer Isyllt Iskaldur; and the crown prince's mistress, Savedra Severos.