Japan, 1988. An explosion caused by a young boy with psychic powers tears through the city of Tokyo and ignites the fuse that leads to World War III. In order to prevent any further destruction, he is captured and taken into custody, never to be heard from again. Now, in the year 2019, a restored version of the city known as Neo-Tokyo—an area rife with gang violence and terrorism against the current government—stands in its place. Here, Shoutarou Kaneda leads "the Capsules," a group of misfits known for riding large, custom motorcycles and being in constant conflict with their rivals "the Clowns."

During one of these battles, Shoutarou's best friend Tetsuo Shima is caught up in an accident with an esper who finds himself in the streets of Tokyo after escaping confinement from a government institution. Through this encounter, Tetsuo begins to develop his own mysterious abilities, as the government seeks to quarantine this latest psychic in a desperate attempt to prevent him from unleashing the destructive power that could once again bring the city to its knees.

[Written by MAL Rewrite]

Set in a different series of events, this story does not follow the previous Appleseed movie canon (despite being directed by the same director of the previous movies); it is an alternate story to their beginnings. Briareos is already a cyborg and did not become separated from Deunan to be later reunited in Olympus to join ESWAT.

Appleseed Alpha depicts the early days of Deunan Knute and Briareos in the 22nd century, as they embark on a journey throughout dystopic ruins of New York in search of the city of Olympus. They are hired by Two Horns, the warlord of the ruined city, to eliminate bipedal combat machines. During the fight, they encounter Iris and Olson, both on a mission. Deunan and Briareos befriend them and decide to join their mission.

Iris is tasked with preventing the malevolent cyborg Talos from capturing a secret weapon humans were building. Talos uses Iris to activate the gigantic war machine.

(Source: Wikipedia)

Growing out of the chaos of a global war, the city of Utopia is populated by humans and bioroids (artificial humans). On the surface, everything is harmonious, but tensions lurk. Into this seemingly perfect society comes a survivor of the wars, Deunan Knute, who carries a legacy that will turn out to be of critical importance to the future of humanity. 

(Source: ANN)

High school student Issei Hyoudou is your run-of-the-mill pervert who does nothing productive with his life, peeping on women and dreaming of having his own harem one day. Things seem to be looking up for Issei when a beautiful girl asks him out on a date, although she turns out to be a fallen angel who brutally kills him! However, he gets a second chance at life when beautiful senior student Rias Gremory, who is a top-class devil, revives him as her servant, recruiting Issei into the ranks of the school's Occult Research club. Slowly adjusting to his new life, Issei must train and fight in order to survive in the violent world of angels and devils. Each new adventure leads to many hilarious (and risqué) moments with his new comrades, all the while keeping his new life a secret from his friends and family in High School DxD! [Written by MAL Rewrite]