The first episode adapts two bonus chapters from Mizuho Kusanagi's 12th manga volume, titled "On That Back" and "Kija." "On That Back" follows an incident at a hot spring hotel, and "Kija" depicts the past of the Hakuryuu Kija. The second two episodes adapt the rest of the Zeno Arc and were bundled with the 21st and 22nd volumes of the manga.
Sometime in the future, terrorism in Japan has become commonplace, and the police have become almost as brutal as criminals. A member of the Special Security Force known as Angel, is the best of the best, stopping at nothing in her fight for justice.
Things get interesting for Angel and her partner, Raiden, when they begin investigating a series of murders in which the victims were known criminals, killed in very unpleasant ways. This trio of killers known as Hunters, is a group of psychics that have banded together to hunt down the lowest scum in the city and bring them to justice.
After a couple of encounters between the cops and the psychics, two of the psychics begin to think that maybe they're not the good guys after all; but the third prefers killing to morality. Augmented by cybernetics from a mysterious source, this third hunter heads out on a killing spree, with the Special Security Force as the first target.
Even with help from the other two psychics and her newly cyborged partner (after an unfortunate accident), Angel is going to have her work cut out trying to find the rogue psychic and the organization behind the Hunters.
Li Meifon is the head of a free, no expenses paid protection/security agency for escorting ships across outer space. Though only 16, she posesses great skill and leadership qualities while commanding her crew aboard their ship, the "Angel Links." However, some unpleasant memories begin to trouble her and she starts questioning her own past and reason for existence. Join Li Meifon and the rest of the Angel Links crew on their adventures through the Oracion star system as they battle pirates, government organizations, and a Tao master, all while finally uncovering Meifon's dark and mysterious past.
After being inspired by the fictional anime, "Luis Monde III", Mikiko "Kuromi" Oguro goes to animation school and and finally lands the job of her dreams at Studio Petit. Upon arriving, she meets the head of production. Unfortunately for her, he dies soon after meeting her and passes his position unto her. Now that she's head of production of "Time Journeys", it's up to her to rally up the lazy animator's and finish the second episode in a week.
Following Studio Petit's popularity for Time Journey's, the crew is now faced with 3 anime at the same time. Rushing to fill the quotas, the owner of Studio Petit hires Takashimadaira, a veteran producer to help Kuromi. However, all Takashimadaira cares about is making deadlines, severely hurting the quality of the images. Shihonmatsu, who has been helping Kuromi, gets angry at the new producer and leaves, leaving Kuromi with a difficult choice: to choose between the quality or the deadline.
Studio Petit managed to survive the production of "Time Journeys," but now that show's finished, and in its place they've got no less than three series to animate, with just four artists, one manager and one director - not to mention one very bedraggled animation runner. And it doesn't help that Shihonmatsu picked this week to quit smoking. As the staff starts to fall behind their crushing deadlines, the owner calls in an old "pro," Takashimadaira, to get production back on track. But once he starts putting speed above quality, the Petit team has to choose between following orders and doing their jobs right.
In the wake of the destruction of a worldwide non-nuclear war, the city Olympus has become the control center of the world. Run by Bioroids (cloned humans made from only the best DNA), it is defended from terrorists by special military forces. Among these are former LAPD SWAT member Deunan Knotts and her multipurpose cyborg partner Brialeos. They face a challenge from the Human Liberation Front and its terrorist underbelly the Argonauts. The leader of this group, Al Ceides, supposedly died 20 years ago in an attack on Poseidon, but now his shadow emerges once again.
Every 30 years, a new princess is chosen from the Hime family to serve the Hayagami. The time has come again, but over these past years, records state not a single female has been born, save for one, the 15-year-old Arata. The only problem is, Arata is actually a male! Forced to disguise himself and take the place of the princess candidate until a formal one can be found, he attends the festival only to witness the current princess, Kokuri-hime, murdered, and his own life is forfeit as well, by the hands of the princess' personal guard, the 12 Shinshou. As he runs for his life, Kannagi of the 12 convinces everyone that Arata is the one who has murdered the princess instead, and now everyone in the Imperial Court is after his head!
In Thrace, Arion is taken from his mother Demeter by the god Hades. In the Underworld, Arion is trained to be a warrior. His training is driven by revenge: Arion was told that his mother`s blindness was caused by Zeus and Zeus` death will remove the curse. Finally, Arion and Geedo (a huge ape-like creature who had become Arion`s friend and companion) left the Underworld to find Zeus. Seneca, a small thief, makes off with Arion`s sword and this leads Arion to his first encounter with the forces of Zeus, commanded by his daughter Athena. Arion is captured but is later set free by Lesfeena, Athena`s mute serving girl. As Arion rejoins Geedo and Seneca (and worries about Lesfeena), the forces of Zeus and Poseidon face each other in battle. In the background sits the scheming Hades, and the calm Apollon who seems to have plans of his own.
A few years after they first met, Naomi Armitage and Ross Syllabus have started a family. Despite their normal lives, they must keep their identities a secret because many people beleive that Robots do not deserve equal status with humans. Ross has an oppurtunity to abolish these ideas on Earth through a vote, but organizations in the shadows are working so that it doesn't happen.
It has been announced that Hiromu Arakawa's Arslan Senki manga will bundle OVAs in the fifth and sixth volumes, to be released on May 9 and December 9 respectively. The first OVA will include an original story supervised by Hiromu Arakawa, while the content of the second OVA has not been announced yet.