The Diclonius, a mutated homo sapien that is said to be selected by God
and will eventually become the destruction of mankind, possesses two
horns in their heads, and has a "sixth sense" which gives it
telekinetic abilities. Due to this dangerous power, they have been
captured and isolated in laboratories by the government. Lucy, a young
and psychotic Diclonius, manages to break free of her confines and
brutally murder most of the guards in the laboratory, only to get shot
in the head as she makes her escape. She survives and manages to drift
along to a beach, where two teenagers named Kouta and Yuka discovers
her. Having lost her memories, she was named after the only thing that
she can now say, "Nyuu," and the two allow her to stay at Kouta's home.
However, it appears that the evil "Lucy" is not dead just yet...