"Beast Servants") is a Japanese manga series written and illustrated by Touya Tobina which first began in December 2009.
Takamichi Hachioji, is a sixteen (later seventeen)[4] year old girl who comes from a family of "Dark Hunters", whose job it is to hunt down demons and slay them.
At first reluctant, she then accepts them and raises the two, calling them Snow[Setsu] (a white wolf who wears Campaign for Nuclear Disarmament-logo earrings) and Night[Yuugure] (a black wolf who wears glasses in his human form).
In the present day, Snow and Night have grown at their usual wolf rate, meaning that in their human form, they now look like teenagers at the same age as Takamichi, despite being three years old.
Most of the time it is all nice and gentle and Snow (Setsu) and Night (Yuugure) try and win Takamichi's love and praise, albeit not entirely successfully.