Case: Unsolved Past (Death Note Fanfic)

Task Force member Ayame Kurosaki has always been struggling with her life. Not just from the accident that made her loose her prior memories before the age 12. Her adoptive parents car accident in a L.A business trip at 14 and since the age 15, she and her adoptive brother haven't spoke. Her whole life was filled with questions and confusion. But throughout her difficult life she wasn't alone...
Her best friend...a Shinigami named Mugen,claims to stayed by her side since she was born.
Born with Shinigami eye, which only her right eye,she's kept it hidden. Making right of her life as a task force member, under guidance of Chief Yagami, things turn for the worst.
Mysterious deaths of cardiac arrets with prison inmates, destroyed her composure.