In the aftermath events of the first Garo series, Kouga Saezima sets out to the northern district upon reassignment. While hunting down Horrors, a young priestess named Rin informs Kouga that she has been sent by Priest Amon to save a presumed dead friend in the Makai realm within Kantai, Jabi. Kouga teams up with Rin in a quest to save Jabi as they are hindered by supernatural and Makai forces alike. Meanwhile somewhere in Japan the dark Horror Lord Legules was resurrected and plots a means to alter a supernatural event called Midnight Sun within Kantai to plunge the world into darkness with his "family."
北の管轄を守る鋼牙の元に、魔戒法師の里・閑岱からやって来たという少女・鈴が現れた。彼女から話を聞いた鋼牙は、彼女の案内で閑岱へ向かうことになる。だが、鋼牙が閑岱に到着すると、一本の槍が鋼牙へ目掛けて飛来。そして、その持ち主である魔戒騎士・翼が、鋼牙をこれ以上進ませまいと攻撃を仕掛けてきた...!!
