Light: Who would be following me?
Does this mean L is already starting to suspect the police?
If he can investigate the police, [it tells] me a lot of resources of manpower.
Even if he has as many as 50 people on the case, I don't see how they could ever figure out that I'm Kira.
I shouldn't look like anything other than an average high school senior.
But the longer this person keep following me, the greater the chances to figure out who are really L.
Above all, I need my stoker's name.
Once I figured that out, I can get rid of him for good.
Ryuk: Light. I'm gonna let you in on a little secret.
What makes the Shinigami and human's who has a death note different.
Well there are two things.
And why do Shinigami have to write the names of humans in the death notes?
You got no ideas?
Light: Of course not. Why do I know that?
You know, you sure are talkative today.
Ryuk: It's because we are able to take human life spans for ourselves.
Light: Huh? we? what do you mean by that?
Ryuk: Let's say you have a human who is due to live until the age of sixty and god of death wrote that this person would die at forty.
Sixty minus forty equals twenty.
Now those twenty years taken from someone in the human world are added to that god of death's life.
Ryuk: So it means that as long as we don't slack off, even if someone was to shoot us in the head, or stabbed us in the heart with a knife, a god of death cannot die.
On the other hand, no matter how many names you write in your death note, your life span will not increase.
That is the first difference between gods of death and humans who possess their death notes.
Light: Haha. That's something about Shinigami that I haven't heard before.
Pretty interesting stuff.
Ryuk: The second difference between us will probably be an even greater interest to you.
Though this has lest to do with your length of life and more to do with cutting it short.
Light: What do you mean [by] cutting it short.
Ryuk: Shinigami can tell what the person's name is by just looking at the face. We know instantly.
And you have any idea why?
Because through a Shinigami's eyes a human's name can be seen about their heads.
Not only that we see the life spans as well.
Light: The name and life span?
Ryuk: That's right.
I'm able to see your name and life span right now.
If I convert that to human time I could tell you how many years you got left.
But there's no way I'd ever tell you that.
I may have a big mouth but even I wouldn't go that far.
Shinigami never after worried that they won't be able to kill a person just because they don't know the name.
And every time we do take a life we always know exactly how many years we are going to receive.
Our eyes just aren't the same and that is the difference between you and I.
However, if a Shinigami drops his death note and a human picks it up, he can grant that human the eyes of Shinigami, but only if a deal is made, one that has been with us since ancient times.
Light: And what's the deal?
Ryuk: The price for having the Shinigami's eyes is half the human's remaining life span.
That's all of these.
Light: Half of my remaining life span.
Ryuk: Yeah. In other words, if you are supposed to live another fifty years, it'll be twenty five.
If it was one more year, then six months.
Light: I see.
And since you made it clear you're not on anyone's side, it won't help me out.
You wouldn't just give me the name of people I want to kill.
Basically you are saying that I can't simply borrow your powers.
I'd have to pay for them.
Ryuk: That's right.
It's a key part that call all Shinigami are bound by.
I'll say this once more.
Give me half of your remaining life span, and I'll give you the Shinigami eyes.
Light: If I agree, I'll be able to know everyone's name
just by looking at them.
If I had that power, the death note would only be easier to use.
Ryuk: So, what will [that] be, Light?
It is a deal.