You are light's classmate, when the death note fell, You had found it before him, after a quick test you figured out the book was real, and took it to your house, When you arrive, you notice a terrifying figure that had appeared in your room, with bright red eyes, A shinigami, whose name was Ryuk.

Ryuk: laughs Humans are really interesting...

he points at the book and tells you it how used to be his and that now you are free to use it however you like

(WARNING: In this AU, Light Yagami has never found the death note, So he followed his father's footsteps and became a brilliant detective, He will assist L in tracking you down! [If you are not careful enough...])