A year after escaping Sword Art Online, Kazuto Kirigaya has been settling back into the real world. However, his peace is short-lived as a new incident occurs in a game called Gun Gale Online, where a player by the name of Death Gun appears to be killing people in the real world by shooting them in-game. Approached by officials to assist in investigating the murders, Kazuto assumes his persona of Kirito once again and logs into Gun Gale Online, intent on stopping the killer. Once inside, Kirito meets Sinon, a highly skilled sniper afflicted by a traumatic past. She is soon dragged in his chase after Death Gun, and together they enter the Bullet of Bullets, a tournament where their target is sure to appear. Uncertain of Death Gun's real powers, Kirito and Sinon race to stop him before he has the chance to claim another life. Not everything goes smoothly, however, as scars from the past impede their progress. In a high-stakes game where the next victim could easily be one of them, Kirito puts his life on the line in the virtual world once more.

Clad in desert pink and the size of a mere child, the infamous "Pink Devil" mercilessly hunts down other players in the firearm-centered world of the virtual reality game Gun Gale Online. But in real life, this feared player killer is not quite who anyone would expect. A shy university student in Tokyo, Karen Kohiruimaki stands in stark contrast to her in-game avatar—in fact, she happens to stand above everyone else too, much to her dismay. Towering above all the people around her, Karen's insecurities over her height reach the point where she turns to the virtual world for an escape. Starting game after game in hopes of manifesting as a cute, short character, she finally obtains her ideal self in the world of Gun Gale Online. Overjoyed by her new persona, she pours her time into the game as LLENN, garnering her reputation as the legendary player killer. However, when one of LLENN's targets gets the best of her, she ends up meeting Pitohui, a skilled yet eccentric woman. Quickly becoming friends with Karen, Pitohui insists that LLENN participates in Squad Jam, a battle royale that pits teams against one another, fighting until only one remains. Thrust into the heated competition, LLENN must fight with all her wit and will if she hopes to shoot her way to the top.

Saito Hiraga and Louise Françoise Le Blanc de La Vallière go on the offensive after the events of Zero no Tsukaima: Princesses no Rondo. Together, they face off against King Joseph in the Holy City of Romalia with the help of two others who control the power of the “void”. But in the midst of the many conflicts ahead of them, an ancient evil begins to stir in the shadows. Will their close bonds blossom into something more or will they be shattered through the ever increasing difficulty of the tasks that they must undertake? Zero no Tsukaima F follows the story of Louise and Saito as they face their final challenges together.

Five dangerous "seeds" have been stolen from their vault in the world of Evergreen and taken to Earth. Natsuki, an agent of the Queen, has been sent to retrieve them. However, he cannot do this alone and enlists the aid of Chihaya, a middle school student, who is "the only one" who can help him. With his aid she transforms into Magical Warrior Carmine in order to save the humans possessed by the seeds. Questions abound though, such as why Chihaya's mother appears to know all about this secret activity, why Chihaya remembers her father who reportedly died before her birth, and why she dreams of Evergreen, which she has never seen.