In the aftermath events of GARO: Chapter of the Black Wolf, Saejima Kouga sets out to the northern district upon reassignment. While hunting down Horrors, a young priestess named Rin informs Kouga that she's 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 White Night within Kantai to plunge the world into darkness with his "family." It's the final chapter of GARO as Kouga puts his life on the line to save Jabi and defeat Legules before the world is ruined.

Garo: Soukoku no Maryu (lit. Blue Cries of the Demon Dragon) is the second film to the Garo series. The film serves as an epilogue after Makai Senki and leads up to The One Who Shines in the Darkness. The story continues after the events of Makai Senki. Having made a contract with Gajari, Kouga Saejima honors his end of the deal by traveling to the Promised Land to retrieve a part of Gajari: the Fang of Sorrow. After Kouga defeated Sigma, Gajari transported him to the Promised Land, however, his quest had unexpected results.