Police started an investigation after noticing many are dying of a heart attack. So they think someone is killing. A detective named L is put to the task of hunting the killer down, who’ve they nicknamed Kira. A broadcast appears on TV all over Japan, with an inmate who has a death sentence, but Kira (Light Yagami) doesn’t know that. They leaked the name of the person impersonating L and they found out in order for the person to die, they need a name, and they know the killer is in Japan because they only broadcasted in Japan.