Himouto! Umaru-chan manga volume 10 features story and art by Sankakuhead.

Umaru has gotten pretty close to Sylphynford in her gamer-girl disguise, but now she finds her friend has a startling secret! The surprises don't stop there: Kanau appears at Taihei and Umaru's Apartment, and then it's time for parent-teacher conferences... a rare sighting of the girl's mothers!