The Makai fight a secret war against the demon forces known as Horrors, evil creatures that manifest themselves through darkness to devour Humanity. On the frontlines are the Makai Knights, given the task of watching over a district and eliminating any Horrors that manifest there. GARO follows the tales of the Knights bearing the title of ‘Golden Knight Garo’, and their duty to vanquish the Horrors and protect Humanity from the darkness.

Kyoko Odagiri is a beautiful and charismatic clairvoyant. She is also popular and admired by her fans. Today, Kyoko appears on a popular tv show and display her psychic abilities alongside a popular actor. Her performance goes off splendidly with the audience applauding her performance enthusiastically.

Akane is a high school teacher who hears a rumor from her students that there is actual footage on the Internet of someone's suicide. The footage is said to drive anyone who sees it to also commit suicide. Akane does not believe the rumor at first, but when one of her female students dies after viewing the footage, she and her boyfriend Takanori are fatefully drawn into the horror that has been created by the man who appears in the suicide footage, Kashiwada. Kashiwada's intention is to create chaos in the world by bringing back Sadako and the power of her curse. Now Akane has to fight against Sadako and Kashiwada to save the lives of herself and Takanori.

Moga Hakucho, Nemu Watanuki, Mirin Yukino, Emi Odamaki and Ayane Shiomi are all freshman students at Shiromajo Gakuen. All of the girls carry emotional scars from their past. Senior student Risa Kikuta assigns the first year students a hard, but necessary task to gain witch abilities. The freshman students soon realize a spell, but they don't know the hidden secret at Shiromajo Gakuen.

The national university entrance examination is coming up and the students of Class 3/4, which Onizuka Eikichi (AKIRA) is in charge of, enter exam mode. Onizuka who conducts career counselling for the students with assistant form teacher Fuyutsuki Azusa (Takimoto Miori), questions their mentality of aiming for a good university in order to get into a good company.