On a cold December day, Kyon arrives at school prepared for another outing with his fellow SOS Brigade members. However, much to his surprise, he discovers that almost everything has changed completely: Haruhi Suzumiya and Itsuki Koizumi are nowhere to be found; Mikuru Asahina does not recognize him at all; Yuki Nagato is a regular human; and Ryouko Asakura has mysteriously returned. Although he is no stranger to the supernatural, Kyon is disturbed by this odd turn of events and decides to investigate on his own. Finding himself to be the only person that is aware of the previous reality, Kyon is now faced with a difficult choice: to finally live the normal life he has always wanted, or uncover a way to turn back the hands of time and restore his chaotic yet familiar world.

The disappearance of the Spearhead Squadron beyond the horizon does little to hide the intensity of the Republic of San Magnolia's endless propaganda. Vladilena Milizé continues to operate as Handler One, the commander of yet another dehumanized 86th faction's squadron in the continuous war against the Legion. On the Western Front, Shinei Nouzen and his squad are quarantined in a military base controlled by the Federal Republic of Giad, formerly known as the Giadian Empire. The newly-established government grants the saved Eighty-Six full citizenship and freedom. Housed by the president Ernst Zimmerman himself, the group meets his adoptive daughter and the last Empress, Augusta Frederica Adel-Adler. However, within the calm of this tender society, Shinei and his team feel that their purpose is on the battlefield. Before long, they are once again in the midst of the Legion's onslaught as a part of the Federacy's Nordlicht Squadron, accompanied by Augusta Frederica. But, as history repeats itself, they realize that no matter the side, death and pain on the front lines are the only comfort they know.

After graduating from a top university with an impressive extracurricular record in the rugby club, Akira Tendou has nailed every step of the way to securing his dream job. On top of that, a beautiful and kind co-worker always brightens his day in the office! Life seems to be going very well for Akira until he slowly realizes that sleepless nights and brutal work are his new reality. Due to three years of mind-numbing labor in an exploitative company, Akira is unable to recognize the tired, unaccomplished person he has become. On track to losing all passion in life like several of his overworked colleagues, Akira finds his saving grace in the most unexpected way possible—the breakout of a zombie apocalypse. With the free time he finally has, Akira decides to complete a bucket list of a hundred things he wants to do before he eventually gets turned into a zombie. Although he is surrounded by the dead, Akira has never felt more alive!

Substitute Soul Reaper Ichigo Kurosaki spends his days fighting against Hollows, dangerous evil spirits that threaten Karakura Town. Ichigo carries out his quest with his closest allies: Orihime Inoue, his childhood friend with a talent for healing; Yasutora Sado, his high school classmate with superhuman strength; and Uryuu Ishida, Ichigo's Quincy rival. Ichigo's vigilante routine is disrupted by the sudden appearance of Asguiaro Ebern, a dangerous Arrancar who heralds the return of Yhwach, an ancient Quincy king. Yhwach seeks to reignite the historic blood feud between Soul Reaper and Quincy, and he sets his sights on erasing both the human world and the Soul Society for good. Yhwach launches a two-pronged invasion into both the Soul Society and Hueco Mundo, the home of Hollows and Arrancar. In retaliation, Ichigo and his friends must fight alongside old allies and enemies alike to end Yhwach's campaign of carnage before the world itself comes to an end.