Time Prisoners (时空囚徒) is a vampire survival action Chinese webcomic written and illustrated by Bai Xiao. On October 1, 2016, a Chinese-Japanese anime adaptation titled Bloodivores (ブラッディヴォーレス) began airing. The series is directed by Chen Ye and produced by Emon and animated by NAMU Animation and Creators in Pack. 60 years ago, some people began to suffer from a strange case of insomnia that struck the entire population. Unable to sleep for more than a week, a large number of people become completely sleep deprived and eventually went mad with rage. A new medicine was produced to cure the illness but it has a side effect which turned patients into vampires. Later, these vampires were called the "Bloodivores." They are feared by other people and wear a special necklace that sends a signal to the police if a Bloodivore is unable to control their emotions.