Alfred Izuruha is a 10-year-old who lives in the neutral colony cluster of Side 6 and, like most boys his age, is obsessed with the war between the Earth Federation and the Principality of Zeon. Unbeknownst to him, Al's next-door neighbor, Christina, is the test pilot of a prototype Gundam being developed in secret by the Earth Federation in the colony. A Zeon Special Forces team is assembled and tasked with infiltrating the colony in order to either steal or destroy it. When a skirmish breaks out between the Federation and infiltrating Zeon forces, the fascinated Alfred stumbles upon a Zaku mobile suit that has been shot down, piloted by Zeon rookie Bernard Bernie Wiseman. After this encounter, the two start a mutual friendship, so Alfred can learn more about the war that interests him so much, and Bernie can acquire inside information about the colony to aid his team's mission.

After solving the incident of the scattered Jewel Seeds, Nanoha Takamachi happily returns to her everyday life, though now with added magic practice in the morning. Exchanging video messages with Fate Testarossa and the crew of the Arthra, Nanoha eagerly awaits the chance to speak with them in person again. But while studying in her room one day, Raising Heart suddenly calls out to Nanoha and warns her of an incoming attack! The attacker is a young girl named Vita, who calls herself a Belka Knight. She proves her strength by using an intelligent device with a mysterious cartridge system to quickly overwhelm Nanoha. Luckily, the Space-Time Administration Bureau is able to step in before she is completely crushed. Vita and her fellow knights Shamal, Signum, and Zafila are on a mission to steal magical power from mages in order to complete the Book of Darkness, one of the Lost Logia. For what sinister purpose are the knights after this Book of Darkness?

In the 24th century on the planet Aqua, three girls—Akari Mizunashi, Alice Carroll, and Aika S. Granzchesta—continue to work hard toward achieving their goal of becoming Prima Undines: professional tour guide gondoliers. Luckily, the girls have the guidance of the three best Prima Undines in Neo-Venezia—Alicia Florence, Athena Glory, and Akira E. Ferrari—who are known as the Water Fairies in honor of their skill. With their help, the young apprentices train hard and work to overcome any situations that they find themselves in. Aria The Origination follows the hardships and daily lives of these three young girls, who are doing their best to improve as tour gondoliers in Neo-Venezia, a terraformed replica of Venice.

In the year 0068 of the Universal Century, Casval Rem Deikun's life is thrown into chaotic disarray after the assassination of his father, a prolific figure in the crusade towards civil rights for people who live away from the Earth's surface. Casval and his sister Artesia receive aid from soldiers who were loyal to their father, and the siblings are whisked away from their home, separated, and thrown into a twisted fate that sees them come into their own as soldiers and adults. Years before stealing the name Char Aznable or his Red Comet moniker, Casval must contend with the rise of a militarized version of his father's ideology and his own vengeful nature as intergalactic war molds him into a legendary mobile suit pilot.