Witch Hunter Robin - Season 1

Robin Sena arrives at the STN-J's Raven's Flat office in Tokyo a little earlier than expected, and is mistaken for "one of Amon's girls", so is told to go away. The STN-J's witch hunting team discuss the previous night's hunt and capture of Kent Nishihama who, under interrogation, had claimed to have acquired his power from his friend Yugi Higashi. The witch hunting team set out again to the warehouse where Higashi has been hiding out. Meanwhile Takuma Zaizen and Yurika Dojima go and get Robin, who has been waiting patiently in Harry's cafe/bar, and take her to join the rest of the team at the warehouse. They arrive just as Higashi is getting the better of Amon. Robin has the opportunity to demonstrate her pyrokinetic abilities, allowing the team to capture Higashi. The team thanks Robin for her help, except for Amon who simply asks if Robin could "use her power more efficiently". Robin is surprised at the policy of capturing witches, but Miho Karasuma explains that the STN-J consider it "more humane" than killing them. Back at the office, Karasuma welcomes Robin to the STN-J.

The STN-J is ordered to take out Kazuya Misawa, a businessman recently acquitted of the charge of murdering his partner, which witnesses say was done by way of a curse. The media frenzy surrounding the case and an ex-cop with an axe to grind complicate matters as the team tries to ensure that the public remains in the dark about the existence of witches.

When the bodies of mummified witches begin to turn up left and right, the STN-J team finds itself facing a serial murderer, who seems to be active every 40 years or so. But with the suspect of the earlier murders having been swept overboard at sea decades ago, who or what exactly are they facing now?

Robin Sena's daily routine takes her through a park, after her morning prayers. When she discovers that three dead bodies were discovered there prior to her coming to Japan, she and Miho Karasuma decide to investigate further, unaware of the danger that they're placing themselves in as their foe can flay a person alive.

The STN-J must investigate a witch who has mysteriously disappeared. Investigating the places where the homeless of the city congregate, they hope to find a clue as to the location of their target. But when a regular human vagrant is driven mad by fear, they soon find themselves facing an opponent unlike any they've encountered before.

Robin's Vespa runs out of gas in the middle of nowhere, but she's soon rescued from an approaching thunderstorm by Eiko Yano, who offers her a lift back into town. But when her benefactor is found dead the very next day, Robin finds herself mixed up in a case where the size of one's foe is not indicative of the danger one faces.

When a wrecked car with a dead body inside is dredged out of the bay, the STN-J finds itself embroiled in a bank robbery case involving 200 million yen. What initially seemed an open and shut case becomes morally ambiguous when not the remaining suspect Tazawa Tsuneo, but his preadolescent nephew Mamoru Kudō is revealed to be a powerful witch and thus their target.

Who may judge the value of a human life? This is what the STN-J must ask when Yakuza members turn up dead due to witchcraft. A doctor's destiny is to save lives, but miracles that save the lives of the innocent are paid for with the lives of the guilty.

A case of death by burning seems straightforward when a perfect match comes up on the STN-J database. The suspect has died leaving a note confessing to three murders, but two have yet to occur. When the second person on the list dies in the same manner as the first, is it a case of murder beyond the grave or a new facet of witchcraft?

Robin and Dojima work undercover as waitresses at Harry's while searching for Yutaka Kobari, a witch who disappeared two years ago and also the son of Master, the owner of Harry's. But they are not the only ones searching for him. Will father and son be reconciled before Yukata's past catches up with him?

A witch using electricity kills two men and disappears. STN-J knows he's hiding in Walled City, but the place is a maze and no one wants to talk. And once they've found the witch, they still have not discovered where his power came from.

A witch calls Robin back to Walled City to confront her with ancient knowledge. A hacker attacks the STN-J system as the agents search for Robin. Though Robin is safe, her encounter leaves her with an unknown relic, as well as questions not just about STN-J and hunters, but about Robin herself.

An inquisitor comes to Japan to evaluate a witch's chances of becoming a hunter. Solomon Headquarters' powers awakened, but their methods may have been too tough to survive. Suspicion of Robin rises, though Amon attempts to diffuse it.

Amon and Robin go on an unsuccessful hunt. An unseen enemy shoots at Robin with witch-slaying bullets but Amon denies the attack. Secretly, Robin turns over a cartridge casing to Michael to study. Soon, not even Robin's home is safe, as those that hunt her attack those close to her.

Robin hides in Raven's Flat, protected by Michael, Sakaki, and Karasuma who are seeing parallels between Robin and the woman she replaced, Kate. Amon's absence causes Robin's trust in him to waver, but a visit from Master soothes her fears. When an armed force attacks headquarters, Robin is forced to flee, alone.

Robin hides in Raven's Flat, protected by Michael, Sakaki, and Karasuma who are seeing parallels between Robin and the woman she replaced, Kate. Amon's absence causes Robin's trust in him to waver, but a visit from Master soothes her fears. When an armed force attacks headquarters, Robin is forced to flee, alone.

STN-J continues to struggle with two missing members and one too injured to hunt, making Dojima suggest asking Robin for help. Karasuma turns her down, despite worries about her own fading power. Robin babysits an unusual girl and runs into Dojima, who has been searching for her. Later, Robin asks Nagira why he has been helping her, but doesn't get a straight answer.

Nagira meets with a contact in Walled City, who shares a rumor about a "Fragment of Wisdom" that was left behind by the witch Methusaleh, which many, including Solomon Headquarters, are searching for. STN-J notices an increase in murders of witches in Walled City. Robin remembers something she had left in her apartment, only to find it gone. Nagira's search leads him into trouble, but Robin saves him with Michael's help and they realize the nature of the "Fragment of Wisdom".

Nagira and Robin discuss the "Fragment of Wisdom" and take it to a witchcraft researcher, whose wife Hitomi seems to recognize Robin. Nagira hears of a new lead, ends up running into someone unexpected. Hitomi's interest in Robin is explained, and more of both the goals of Zaizen and Robin's own are revealed.

The sinister Hunter known as Sastre has his sights set on Robin. Meanwhile the "Fragment of Wisdom" is stolen from Nagira's safe and winds up in the hands of Sastre. In the oncoming fight, however, Robin realizes she can see Sastre's attacks as they come at her and is able to defeat him. Her powers have fully awakened and according to Amon she is now a witch.

Coming to terms with her newly achieved witch status, Robin decides to meet it head on and track down Solomon's hunters before they find her. Another hunter, an earth craft user, fights with Robin but is defeated thanks to her witchcraft and her awoken power.

Dojima meets with Amon. Nagira and Robin trace Amon's latest activities, which lead them to a house belonging to an old lady. There they discover a diary of a man who co-operated with Solomon Headquarters fifteen years ago doing genetic research. There is also a photograph of a woman very similar to Robin, with Father Juliano in the background. Later on Nagira meets with Amon, who reveals his intention to hunt Robin.
 

The episode starts off with Amon and Dojima discussing Zaizen's motives. It is revealed that by developing Orbo he wants to perform hunts using regular humans. Meanwhile in STN-J, Karasuma, Michael and Sakaki are trying to uncover information about Solomon Headquarters' genetic research. Amon confronts Robin to hunt her down, but does not end up killing her. Later on Sakaki is attacked by the Factory's units and survives thanks to the intervention of Robin and Amon.

Zaizen and the Factory turn on STN-J. Karasuma is taken by the Factory. Michael, Kosaka, and Hattori decide to join STN-J hunters to move against Zaizen. They cut off the security system from the STN-J office to Factory and investigate Zaizen to track down his activity. Soon after that, Solomon Headquarters does an immediate transfer of an imprisoned scientist from Japan to Solomon Headquarters in Europe. Zaizen begins his plan to abduct the scientist to use him for perfecting the Orbo. STN-J successfully defeats the Factory, but the scientist dies at the battle scene. Before his last breath, he mistakes Robin as "Maria" and then after realizing his mistake he says a mysterious line calling Robin "the devil's child."

Robin is sad about the scientist's line thinking that she is an existence that must not have been born. Father Juliano Colegui, Robin's Guardian, explains her about her past and origins as well as his reason for wanting her hunted. Juliano confesses the reason he ordered hunters to hunt Robin is due to his own weaknesses and fear. STN-J team plans and executes its plan to rescue Karasuma from the Factory. Simultaneously, an attack is planned on the Factory by Solomon Headquarters.

The final episode uncovers the origin of Project Robin. It is here that Amon and Robin confronts Zaizen in a final showdown to uncover the truth behind Todo's project. The episode ends off with the Factory destroyed, and most of the STN-J escaping unharmed. The only exceptions are Amon and Robin who have either escaped or been killed in the resulting collapse of the Factory. At the ending, the reactions of the various other characters hinted at them being alive but are said to be dead for their own safety. After the ending song, there is a scene in which a woman wearing similar clothes like Robin comes out of a taxi as a new hunter for STN-J.