ColdEskimo

Hey, I recently recalled a similar anime, I believe the premises were that a male protagonist was transferred into a school suddenly. He later finds out that all the students around him are youkai/monsters and that the head-mistress had him transferred in for the purpose of procreating and keeping the races of the monsters from dying out. Anyone have an idea as to the title? It's really killing me, I believe he also ends up having some sort of special ability or something, but I don't rightfully recall.