After we die our soul should go to heaven or hell depending what kind of person we were during life. Well Tomoko Fukumoto instead, ended up in the world of Death note and to make things crazier she's not even a human but a cat.
Death Note Fanfic
Ruby. She's quiet. Rarely socializes with anyone. That's what she wants you to think.
She's a retired spy. Since she was born her parents, who are also spies, have trained her wanting her to become just like them. Her spy name is Shadow. She blends in, trying not to die every second of the day.
She has a top secret mission. Get close to the suspect. Easy. L has given her a task and she wishes to fulfill it. Without her, L wouldn't know anything about the true cause of the deaths. The notebook.