Who Am I? (L x OC x Light Love Triangle)

We know L is top-rank and world-renowned detective he has solved many cases and has solved them without fault. What we didn't know was that he, someone who is seemingly emotionless, loved a girl. No one knows her real name, only L. Using their aliases, Ryuzaki and Mihara, the duo set out to solve cases and catch the culprit, but during the Kira case they have a secret they must keep while they work with the Task Force and hunt and catch Kira. However, during the case their relationship suffers due to a third person. What could that secret be? Who is that third person? Well, you'll just have to read to find out.

A/N: There is no L x Light involved. xD However, if you want me to do that I can totally do that. xD

*The story follows the original plot of the anime but I change a few things.