The fourth live action film of the Death Note: Light Up the New World is coming out later this month. So, Shueisha has planned to make things easier for fans with this upcoming book.
It will contain all the manga pages and an unpublished story as well.
The unpublished story is a special story that run in the Weekly Shonen Jump in November 2008. The book will be published on 4th October. It has over 2000+ pages. The sales price is 2,500 Yen (24.70$).