In Russell City, a series of mysterious events unfolds, prompting a man to launch a secret investigation to uncover the truth. He follows a cryptic clue, "El Dorado", which leads him to cross paths with a woman searching for her missing brother who also received the same enigmatic message.

Garo: Vanishing Line
In Russell City, a mysterious trend emerges, threatening the city's harmony. Sword, a keen observer, is the first to sense the danger and begins to uncover the truth in secret.