The Human World
is a term used by monsters
to describe the place outside general monster populated area, like Yokai Academy
Generally populated by Humans, but it is not known of monster existence, like the Witch Hill. The only two personnels in Yokai Academy born in the Human World are Tsukune Aono and Hokuto Kaneshiro.
The staff of Yokai Academy work to keep the Human World ignorant of the existence of monsters. Such examples are foiling Lady Oyakata and Alucard.