S4.E4 ∙ Oathkeeper

The spirit of Kiba the Dark Makai Knight influenced everything since the beginning. Though he called himself a Makai Knight, Kiba was no different to a Horror. Kiba's spirit resides inside what was once a grey colored Makai Armor that's filled with the dark knowledge of Makai Power. As Barago absorbed Horror after Horror, Kiba eventually deformed into an organically pure black armor with a cape. Kiba assumed full control over his host upon Meisha's defeat by Kouga. Actor and musician Masaki Kyomoto reprises his role as psychologist and counselor Karune Ryuzaki, the disguise for villainous Makai Knight Barago who is later taken over by the Dark Makai Knight Kiba, from the original GARO television series in a film revealing the character's history as well as the character's actions during the television series prior to his final battle. Mika Hijii also reprises her role as Kaoru Mitsuki, the female lead of GARO and one of Ryuzaki's patients who Barago intends to use to revive the Horror Messiah. Singer Leah Dizon joins the cast of Kiba Gaiden as the mysterious woman known as Makai Monk Elda who directs Barago towards his goal.

In order to protect humankind, Kouga Saezima makes a contract with powerful Kazari. Kouga Saezima travels to the land of promise to bring back the Fang of Sorrow. When he gets there, Kouga Saezim loses the Garo sword, magic clothes and the Mado ring, which he always carry when he fights. Then, Kouga Saezima in a dense forest saves a girl called Meru. She calls herself the "thing".

Su-Hyun, a 30-year-old art lecturer and his girlfriend, Sun-Young have lived a peaceful life until he comes across an antique wooden bed made from gingko tree and gets pursued by the ghost of General Hwang. Resurrected General Hwang roves modern Seoul ripping the hearts out of people to maintain human form. Su-Hyun does not know why General Hwang seeks to kill him but soon finds out that in their previous lives they were enemies. More than a thousand years ago, court musician Su-Hyun fell in love with princess Midan, who was General Hwang's fiancé. Princess and the court musician's elopement ends in tragedy when Hwang abducts Midan and kills Su-Hyun. On this mournful scene arise a pair of gingko trees housing the souls of Midan and Su-Hyun. General Hwang destroys one of the trees and the other tree embodying Midan's soul gets crafted into a bed. Confined in the bed for a thousand years, Midan longs to meet her beloved court musician, reincarnated as Su-Hyun. Discovering the heartbreaking love story in his past life leads Su-Hyun to confront with General Hwang, who still desires Midan. Su-Hyun and Midan's short reunion was impeded by General Hwang's bursting on the scene. Now, Midan chooses to be locked up in the bed, to run away from Hwang despite it being in flame. Midan and Su-Hyun may have to wait another thousand years to meet again but they're convinced that their love for each other will never die.

The gates of hell open to let out the ghosts of the dead Chun Sing is visited by his deceased father, who tells the young man that his enemy is a priest who commands the dark forces of black magic. Luckily, Chun Sing gets help from a magic book, a group of friendly ghosts, and a house full of hookers.

The story of Makai Priestess Bikuu and her duties as a Darkness Hunter.