Anime Japanese Anime

60 years ago, some people are suffered from strange case of insomnia that struck the population. Unable to sleep for more than a week and completely sleep deprived, these people went rage. A new medicine was produced t o cure the illness, but has a side effect where the patients are turned into vampires, which later called the "Bloodivores". They are feared by other people and wears a special necklace that gave signal to the police if Bloodivore unable to control their emotions.Mi Liu is called "child of hope" - born from a human and a Bloodivore, but when he along with his 3 friends vilified for killing all humans in the bank they robbed, they are sentenced to death. But a strange thing happened where they thrown into a mysterious place with a lot of unexplainedable monsters, along with other sentenced-to-death prisoners.