Death Note

Light Yagami is an ace student with great prospects--and he's bored out
of his mind. But all that changes when he finds the Death Note, a
notebook dropped by a rogue Shinigami death god. Any human whose name
is written in the notebook dies, and now Light has vowed to use the
power of the Death Note to rid the world of evil. But when criminals
begin dropping dead, the authorities send the legendary detective L to
track down the killer. With L hot on his heels, will Light lose sight
of his noble goal... or his life?