Mitsuki is an ordinary thirty-something office worker leading a monotonous 9-to-5 life. His hum-drum routine is suddenly shattered when he tries to help a girl in distress, only to be unexpectedly transported to a different world. While the girl is meant to be there, Mitsuki is out of place, and nobody knows what to do with him. Fortunately, Volk, a striking and noble knight, takes it upon himself to care for Mitsuki--even gently tending to him after he's rendered unconscious from an injury. But when Mitsuki comes to, it's not Volk next to him but a large black wolf! Just who--or what--is Volk and how is Mitsuki expected to survive in this unfamiliar world?