Manga: Marugoto Anju Gakuen

Fortunately, Kaguya doesn't have much trouble posing as a girl.

Marugoto Anju Gakuen (literally, Completely Anju High School) is an Ecchi Harem manga by Amatsu Sae. Sure, it's fairly formulaic, but still enjoyable if you're okay with that.

As a new transfer student, Kaga Kaguya has just arrived at Anju Gakuen, Japan's most prestigious boarding school for Youkai. Left on the school's doorstep in a cardboard box, Kaguya's been given strict orders not to return home until he's reached the number-one rank in the school. There are a few problems with that, though — as a human, Kaguya is deathly afraid of the other students. More important, though, is the fact that Anju Gakuen is an all-female school... and his roommate, a gorgeous kitsune, is none too pleased with the idea of bunking with a boy.

This manga provides examples of: