Remastered version of the Majin Buu saga that adheres more to the manga's story.

Graduation day is finally here, marking the end of Koyomi Araragi's eccentric high school life full of peculiar relationships with otherworldly beings. However, Araragi is unexpectedly absorbed into his own bathroom mirror and trapped inside a bizarre world where everything he knows is completely reversed—the haughty Karen Araragi is shorter than usual, poker-faced Yotsugi Ononoki is brimming with emotion, and cute ghost girl Mayoi Hachikuji is a grown woman! But not everything is as it seems. Zoku Owarimonogatari details the story of Araragi's endeavors in this new world as he struggles to return to his home and understand the nature of this bizarre dimension.

After a janitorial mishap, an unsuspecting custodian transforms into Janemba, a fat, yellow demon who wreaks havoc throughout the afterlife. Gokuu Son has been competing in martial arts tournaments for the undead since his heroic death in the battle against Cell. Soon, Janemba's chaos draws Gokuu and fellow combatant Pikkon toward him, forcing the pair to figure out a way to defeat the giant monster. After a bout with him, Gokuu witnesses Janemba undergo another transformation: the demon sheds his fat and changes color, turning into a sword-wielding enemy more powerful than anyone Gokuu has faced thus far. With the aid of his similarly deceased rival Vegeta, Gokuu must stop the terrifying Janemba from disrupting the very fabric of the universe.

Ghostly, primordial beings known as Mushi continue to cause mysterious changes in the lives of humans. The travelling Mushishi, Ginko, persists in trying to set right the strange and unsettling situations he encounters. Time loops, living shadows, and telepathy are among the overt effects of interference from Mushi, but more subtle symptoms that take years to be noticed also rouse Ginko's concern as he passes from village to village. Through circumstance, Ginko has become an arbiter, determining which Mushi are blessings and which are curses. But the lines that he seeks to draw are subjective. Some of his patients would rather exercise their new powers until they are utterly consumed by them; others desperately strive to rid themselves of afflictions which are in fact protecting their lives from devastation. Those who cross paths with Mushi must learn to accept seemingly impossible consequences for their actions, and heal wounds they did not know they had. Otherwise, they risk meeting with fates beyond their comprehension.