In the manga, Light shrieks at Mikami to write everyone's names in the Death Note and kill them, for it is his "role". To this, he questions how he can do so if he is holding a fake Death Note.

Why The Death Note Manga Ending Packs More Punch Than The Anime Light Yagami's true tragic fall unfolds in the Death Note manga, which deconstructs his arrogant Kira persona in brutal detail.

While the manga ends with a panel of an unnamed Kira worshipper, the anime added a scene of Misa standing on the rooftop of a building, and writer Tsugumi Ohba also implied in the guidebook Death ...

There’s some value to that, too. The original Death Note manga isn’t out of print, so someone could pick up volume 1 (or 2, or 3, or you get the idea).