He met the girl of his dreams. If only he can meet her again.
After leaving a party at a women's dormitory (aka the "virgin vault"), Matthew is trapped in an elevator with an unknown, and unseen, woman when the power goes out. Matthew and this unknown woman have sex in the dark. When Matthew wakes up in the morning — still in the elevator — he finds himself alone with a pair of her panties.
On a mission to find his mystery maiden by finding a matching bra for the panties, Matthew becomes the maintenance boy of the virgin vault. He releases mice and goes room to room setting traps.