The Witches of Adamas Vol. 8 (manga)

Principal Shizuka, the boss of the witches, has transformed Yukinari’s school into a co-ed dorm. And no one is allowed to leave! There, men serve women at the very bottom of the social totem pole, expected to trade sexual favors to get by. Though he battles to keep himself in check, Yukinari is forced to room with a girl with an insatiable sexual appetite. How’s he going to wiggle out of this one?!