Specials included on DVDs and Blu-rays. The series takes place in an alternate version of Japan called Great Japan (大日本国, Dai Nippon-koku), in an alternate timeline where the Tokugawa shogunate remained active and has remained semi isolated from the rest of the world after their defeat by American forces in World War II. And the Americans have bases on Okinawa and southern great Japan. The story takes place at Buou Academic School (武應学園塾, Buō Gakuen-juku), an academy located at the base of Mount Fuji where children of military families train to become samurai warriors. The academy is in the middle of a power struggle between Yukimura Sanada and Matabei Goto of the Toyotomi faction and the powerful student council that rules the school, and Muneakira Yagyu, the owner of the Yagyu Dojo, and the mysterious Jubei Yagyu are dragged in the middle of the conflict.

The Chosen Children are in shock after the betrayal of Meicoomon, the digital monster who had recently joined their group alongside her human partner, Meiko Mochizuki. Koushirou Izumi is determined to diagnose the infection that took control of Meicoomon. Meanwhile, Takeru Takaishi realizes that his own partner, Patamon, is starting to exhibit alarming symptoms similar to that of other infected Digimon, like Meicoomon.

Just then, the Chosen Children receive a message from the mysterious entity Homeostasis, who informs them that their world is in danger of total destruction—and the Digital World, the home of the Digimon, is too. Homeostasis plans to enact a "Reboot," which will reset all the data that makes up the Digital World and eradicate the infection. However, the Reboot will also erase the memories of all Digimon, including the Childrens' partners. Can the Chosen Children stop Meicoomon before the Reboot becomes necessary, or is this the end of their time together with their Digimon?

[Written by MAL Rewrite]

Ten years ago, Jiang Xiaobai lost all his memories due to a traumatic event he no longer remembers. Now working as a trainee in Editorial Office No.2 of Wen Zheng Magazine, a literary periodical based in Chongqing, he is excited to begin a new chapter of his life: in two days, he finishes his probationary period and officially starts his job as an editor. He gives no thought to his recurring dream of a girl whose face can never clearly see. That evening, one of Jiang Xiaobai's seniors passes him the task of rushing to the airport to escort the idiosyncratic rising author Tong Li, who has returned from America to launch her first serialized novel in Chinese. As punishment for this senior reneging on his own duties, Jiang Xiaobai replaces him as Tong Li's new editor. Though they get off to a rough start, Tong Li soon recognizes Jiang Xiaobai as someone precious from her high school days. Before they know it, the wheels of fate are set in motion, as Jiang Xiaobai slowly uncovers clues about a long-forgotten girl from his past. [Written by MAL Rewrite]

Millennia ago, a war was fought between the Netherworld and the Spirit World. Ultimately, the Netherworld was destroyed and Lord Yakumo, the King of the Netherworld, was banished to the depths of space. Now, five defenders from the Spirit World must team-up against Yakumo's Demon-Gods for possession of five, mystical sites. But Lord Yakumo is dangerously close to reclaiming the Power Sphere—the source of the Netherworld's energy—and once it is again in his possession, our world will become the new Netherworld.