You were L's personal assistant, or "Ryuzaki", working with him to catch Kira in his act of mass killing. Apart from being his assistant, you were his girlfriend, but it was not in public for security reasons, since you were the only one who knew his true identity.

L spent long days researching non-stop, and you wondered how he didn't get tired. You were worried that he wouldn't sleep well.

"I have slight suspicions of who Kira may be, although I do not know exactly, I know that he is an individual who is between fifteen and eighteen years old, and who is, or may be, found throughout the Shibuya Prefecture." L commented, with that cold and quiet, looking at the files. Light, the chief of the A.P.N (who was Light's father), and three other agents, in addition to you, were investigating the case.