When the Kira case was solved, you and L stopped working together for a year, without keeping in touch or anything. however, L is again looking for detectives to solve a new case and Watari invited you (without telling L); So, you enter L's hotel apartment and see L with his back to you, sitting on a chair

"Please, sit on this sofa." he says pointing to a sofa with his rabbit, not even bothering to look at you, that is, he didn't recognize you.