Simon and Kamina were born and raised in a deep, underground village, hidden from the fabled surface. Kamina is a free-spirited loose cannon bent on making a name for himself, while Simon is a timid young boy with no real aspirations. One day while excavating the earth, Simon stumbles upon a mysterious object that turns out to be the ignition key to an ancient artifact of war, which the duo dubs Lagann. Using their new weapon, Simon and Kamina fend off a surprise attack from the surface with the help of Yoko Littner, a hot-blooded redhead wielding a massive gun who wanders the world above. In the aftermath of the battle, the sky is now in plain view, prompting Simon and Kamina to set off on a journey alongside Yoko to explore the wastelands of the surface. Soon, they join the fight against the Beastmen, humanoid creatures that terrorize the remnants of humanity in powerful robots called Gunmen. Although they face some challenges and setbacks, the trio bravely fights these new enemies alongside other survivors to reclaim the surface, while slowly unraveling a galaxy-sized mystery.

The final battle against the Dark Territory drags on, as players from all over the world flood the Underworld's servers and plunge the Human Empire into utter chaos. Asuna Yuuki and her friends defend their new allies with everything they have, but their numbers are falling. Meanwhile, Alice Zuberg heads toward the World's End Altar while Gabriel Vecta Miller relentlessly pursues her. Meanwhile, members of Rath strategize a plan in an attempt to restore Kirito's damaged fluctlight. However, the intruders occupying the main control room have other plans. Surrounded by death and despair, when all hope seems to be lost, one voice reaches out to Kirito—a familiar one saying, I will always be by your side. Sword Art Online: Alicization - War of Underworld 2nd Season is the epic conclusion to Akihiko Kayaba's dream of creating artificial human intelligence. Now it is up to Kirito and his friends to protect this collapsing world from the people that still think it is just a game.

The war between the Terrans and the Vers Empire of Mars has ended, allowing humanity to blissfully enjoy their lives in a time of peace. Nineteen months later, however, the Vers princess makes a shocking public declaration: the Terrans are a foolish race that covets resources, destroys nature, and are devoted to the pursuit of pleasure. And so, to protect their precious Earth, she calls upon her knights to take up arms, and the raging battle between the two civilizations reignites. Slaine Troyard has found a place among the Martians, giving Earth a short respite from the war against the Vers Empire. However, a peaceful resolution seems inconceivable. The various people who fought desperately for survival in the past now find themselves in the midst of yet another bloody and chaotic conflict, one that will forever alter the fate of humankind.

Following NERV's failed attempt to retrieve the Spears of Longinus and carry out the Human Instrumentality Project, the destruction caused by the Fourth Impact has been largely averted. In a state of disarray, Shinji Ikari, Asuka Langley Shikinami, and Rei Ayanami travel to Village 3—a survivor settlement free from Earth's ruination. There, Shinji slowly comes to terms with his past, developing an entirely different life from his days as an Evangelion pilot. Meanwhile, NERV makes preparations to continue the Instrumentality Project by means of a new Impact. When WILLE's main aerial battleship arrives at the village, Shinji decides to board, believing that he can help by piloting an Evangelion. As new secrets are uncovered and a battle between WILLE and NERV approaches, the future of Earth hangs in the balance. Can Shinji save humanity and the rest of the world one last time?