Never saw the anime myself (To be honest, an anime which mostly has action of writing down names isn't for me...).
It's actually not a bad anime. It was very smart at times, but at other times they tried too hard to be smart and it came off as dumb. They actually had a part where two characters eye each other down for hours debating inside their own heads whether they should try to win a tennis match or lose so that the other doesn't become suspicious. To make matters worse, they
actually pulled the "what if he suspects that I know? What if he knows that I suspect that he knows? What if he knows that I know that he knows that I know that knows that I know that he knows peanut butter i know that he knows that I suspect him?" They went there. Other than that and a tiny number of other things, it was pretty solid and I was shocked.
That aside, any more talk about the anime can go in it's own thread in the Popular Media section.
Now for a recap so that people have a clear understanding as to what this thread is about.There's quite a bit that goes on in the anime, but for sake of conversation, all anyone needs to know is that the show revolves around a black book.
When a person writes a person's name, date of death, and cause of death, the person will die in said way. If the person is incapable of performing an action or if it is impossible for them to die in the specified way, that person will have a hear attack instead. If only a name is written, but no cause is written, the person will suffer a heart attack. The person who writes in the book must picture the face of the person whom he wants to kill, otherwise nothing will happen (to prevent people with a similar name from dying).
There are a few other rules, but that's about the jist of it. The guy in the anime decides to that he would play God and kill everyone he thought deserved to die. To show that he means srs bsns, he kills a bunch of prisoners. To remain spoiler free, let's just say that this results in a game of cat and mouse.
The anime basically allows the audience to decide whether someone should have the ability to kill whoever they want, even if they have good intentions. It also raises the question as to whether such a person can be trusted and how far the person will go to keep his ability to kill those whom he believes should die.
Also, I think Kira is the name of the person with the black book, can't remember for sure.