Refers to the mythical creature that transforms from human to wolf, often under a full moon.
満月の夜、狼人間が現れると言われている。
It is said that werewolves appear on nights of the full moon.
Compound of 狼 (wolf) and 人間 (human). The exact origin is uncertain, but it is a straightforward calque or translation of the Western concept of werewolf.