Shorts played before Made in Abyss Movie 3: Fukaki Tamashii no Reimei in Japan's theatrical screenings.

The year is 972 A.D. in Kyoto, the capital of ancient Japan. Kyoto is becoming a corrupt and run-down city; selfish samurai and onmyoji, who care only about gaining political power are everywhere. To make matters worse the city is suffering from famine and widespread disease. Unable to ignore the condition of the city any longer, the Imperial Court decides to send Minamoto no Raiko, a famous samurai well-known for his archery skills, to recover a legendary gem said to hold mysterious power to save the world. However Raiko also falls ill to disease. Instead his youngest sister, Hikaru, decides secretely to make the journey in his place. Hikaru meets many people, and has many adventures while on her trip for the legendary gem. (Source: ANN)

Denizens from the Crimson Realm continue to infiltrate Misaki City and steal life energy from humans. To combat this threat, Flame Hazes are tasked with saving humans from losing their existences. But while it is a Flame Haze's duty to protect humans, Shana—the "Flame-Haired Burning-Eyed Hunter"—seems to be focusing her attention on one human in particular: Yuuji Sakai, a teenage boy who was unwittingly dragged into the fight between Crimson Denizens and Flame Hazes. Since her first encounter with Yuuji, Shana has started to see him as more than just a friend. In fact, Yuuji wonders if Shana might have revealed her feelings to him once before, but it is difficult for him to confirm due to her hot-and-cold personality. Nonetheless, their days pass like any other, until a new transfer student arrives at their high school—one who bears a striking resemblance to an old enemy. Yuuji and Shana have no time to dance around their feelings for each other; while their adversaries from the Bal Masqué organization plan their next attack, the two must keep their guard up as they explore the origin behind the coveted magical object within Yuuji's body, the "Midnight Lost Child." [Written by MAL Rewrite]

Yuji disappeared the fateful night he was supposed to choose between a life combating evil by Shana's side or as a normal teenager. He returns from near-death to lead the Crimson Denizens in a dubious plot to bring peace to the universe, but Shana isn't fooled. In an explosive reunion, the fiery warrior faces her unlikeliest of foes while Flame Hazes from across the world join forces to ignite a war that will determine the fate of all supernatural kind. (Source: FUNimation)