This is the first volume of the Re: Dollars Arc which continues from the previous manga, starting with the Akane Arc.
Previous Volume: Durarara!! Yellow Scarves Arc Volume 03
Next Volume: Durarara!! Manga Re: Dollars Arc Volume 2
From Yen Press:
Mikado Ryuugamine is just trying to pass his second year of high school peacefully, but when he gets word that someone within the Dollars gang is causing trouble, that's out the window. Everybody's in trouble: Izaya is scheming, Mikado's classmate knows his secret, and Shizuo's being targeted by a mysterious girl--just another day in Ikebukuro!
Chapter 1: The Fighting Figure, Slightly Troubled
Chapter 1.5: Side Story
Chapter 2: These Adults, Squirming
Chapter 3: Read Online
Chapter 4: Berserker, Stirred Up
Chapter 5: Youth Sparkles and Fades
Chapter 6: A Planned Dance
Chapter 7: Boys and Girls, Wandering In The Maelstrom