Darkness
Keita Aono goes to school one day, and his class happens to have a new student. That student is a girl named Hinoki Sai, Keita's childhood friend. Later, Keita gets himself lost in an amusement park where many people have mysteriously died. Keita catches up with Hinoki, and the two are attacked by a large monster. Who will save them? The being known as Betterman.
Aired 02/04/1999EP 1 - Darkness
Betterman
A deadly virus known as "Algernon" has attacked humanity with vicious meaning. At the forefront of the battle is the mystifying Akamatsu Industries - disguised as a heavy machine factory in Tokyo, this undercover organization uses neural enhanced weapons known as NeuroNoids to battle Algernon. Also helping with their secret efforts is the mysterious mutant who is only known as "Betterman".
(Source: Anime News Network)