Manga Volume 16

 is the sixteenth volume of the manga adaptation of That Time I Got Reincarnated as a Slime. The special edition of this volume is bundled with an OAD.

Synopsis
THE DRAGON’S DOMAIN

In the aftermath of Rimuru’s ascension to Demon Lord, his friends and allies are taken aback by his newfound power, but even more shocked at the return of the dreaded Storm Dragon, Veldora. Meanwhile, the other Demon Lords are all too wary of Rimuru’s evolution, which upsets their delicate balance of power and seems to be a harbinger of greater struggles to come...

Chapters

 * Chapter 71: The Unleashed
 * Chapter 72: Swirling Conspiracy
 * Chapter 73: The Majins' Scheme
 * Chapter 74: Man-and-Monster Summit 1

Bonus Short Story:
 * Veldora's Slime Observation Journal