A young girl named Zuru sets out on an expedition through a post-apocalyptic city controlled by machines in a desperate hunt for food. Things go awry when her team accidently triggers the city's AI defense program called the Safeguard. Attacked by the machines, her companions are on the verge of being annihilated when a mysterious man named Killy arrives and exterminates the hostile units.

Despite his heroic intervention, Zuru is hesitant to trust Killy and questions his motives. He reveals to have come from thousands of levels below the city in order to find humans possessing the Net Terminal Genes—a trait that would allow humans to regain control of their civilization and shut down the Safeguard. After hearing his story, Zuru and the rest of her team join Killy and embark on a journey in search of the Genes that could prove to be mankind's last hope of survival.

[Written by MAL Rewrite]

Shy and soft-spoken Fumi Manjoume and upfront and caring Akira Okudaira were best friends in elementary school, but this changed when Fumi and her family moved away. Years later, Fumi moves back to her hometown after being accepted at Matsuoka Girls’ High School. She finally reunites with Akira, who is going to attend Fujigatani Girls’ Academy. Despite their reunion, their relationship isn't the same as it was years ago. As soon as Fumi starts attending school, popular senior Yasuko Sugimoto takes notice of her and flatters her more than any other underclassmen. After running to Akira for help so many times before, Fumi must figure out who she is as a person instead of standing in someone else’s shadow. However, that doesn’t stop Akira from wanting her friendship with Fumi to be as it once was. Will the girls be able to conquer the high school stage of growing up before it pulls them apart? [Written by MAL Rewrite]

Two years after meeting Aoi, Kaoru and gang are still up to their normal habits. Kaoru now in grad school and the tenants being as rowdy as ever what will become of Aoi and Kaoru's love. Two years has passed since Aoi and Kaoru were freed from the bonds of their families. They continue to live their normal lives with their usual friends in their house.

OVA bundled with the Accel World simulation and action games. The Blu-ray OVA discs came with the PS3 limited edition versions and the DVD with the PSP limited edition versions. The project was split into two PSP and PS3 titles, and one episode was released with each game: #EX01: Reverberation;Zankyou (bundled with Stage:01 Ginyoku no Kakusei) #EX02: Vacation;Onsen (bundled with Stage:02 Kasoku no Chouten)