The elevator reached the roof, and the doors opened up. He heard a commotion going on, so he poked his head out to look. He heard the girl cry out something about a future diary again. It was just a cellphone the unknown person had. But, the girl had a cellphone too. Looking her over, her name was Yuno Gasai. Strangely, she had no lifespan. And just like she said, his name was Yuki, and he had no lifespan either, he'd make a note of that. He deduced that these cellphones were important somehow. Going by the name, they possibly told the future in some way. So that was it. They were playing some sort of game of cat and mouse. They way the unknown person looked, he or she was probably a serial killer. If the scum's mask fell off, he could see a name to write. Deciding he had to let this play out a bit, Light went and hid behind some crates. The elevator closed.