Umemaro 3d 11 Volumes [exclusive] -

Umemaro 3D! A groundbreaking manga series that pushed the boundaries of storytelling and visual innovation. "Umemaro 3D 11 Volumes" is a compilation of 11 volumes of the popular Japanese manga series written and illustrated by Shinji Makari and 3D Works. The series was first published in 2006 and ran until 2010.

Historically, these volumes document the shift of the Japanese adult industry from physical media (DVDs) to the digital "doujin" market. Umemaro 3D 11 Volumes

To address your specific query:

Volume 9 took the lessons of the "mini-movies" (which often had convoluted plots involving demons or monsters) and applied them to a mainline volume. It introduced a sci-fi/fantasy element, moving away from the "reality" of schoolrooms and offices. This allowed for more acrobatic, gravity-defying positions that 3D animation handles better than 2D. It was a statement: 3D should do what cannot be drawn. Umemaro 3D

The reason for Umemaro's popularity lies in the technical execution: The series was first published in 2006 and ran until 2010