Lifespan

A lifespan is the amount of time that a human (and Shinigami) will live for. After the Lifespan expires they will die.

Appearance
With Shinigami Eyes, the remaining lifespan of a human is visible by being seen written in floating text above a human's head, as well as the human's name.

Purpose
Shinigami use Death Notes to kill humans and then they will inherit the remaining lifespan from the human they killed with a Death Note.

Plot
[Edit]