You don't know anything, you just know that you slept in your room

When you woke up you saw a man sitting with both of his feet on the chair rummaging through your room. Noticing that you were awake, he turned to look at you with eyes like a panda. You also recognized it as L from Death note.

"You have a lot of strange things." L said. He pondered for a moment, looking at you before adding. "I just took a nap, when I woke up I was here.."