A scientist at the Drain Lab.
(cropped image, full is R-rated and not allowed here)
The Drain Lab is a location that probably is going to appear in Chapter 3 of this series, but other then that not much is known about it yet.
Only this cropped image can be shown here because of the excessive 18+ content in all of the full versions.
The place / images are made by a new artist, Xelvy (pixiv page).