It is milk squeezed from the breasts of the monster called holstaur which has distinctive black and white fur. The milk has a nice taste that is mellow and full-bodied and it melts almost like when a holstaur is having sex with her husband. It's delicious to drink as is, and it is also highly popular as an ingredient used in cuisine and confectionery. There is only a minor amount of demonic energy mixed in with it, which is unusual for a monster-related product, so humans can also drink it with peace of mind. Even among humans, there's no end to the number of people who have been charmed by this milk. Trade is bustling, and sometimes it even circulates in anti-monster states.