The story will follow four girls who seek to use their songs to heal and soothe the people of their world. The tagline reads, "Kindhearted, powerful songs heal the world. These are beautiful miracles sung by humanity."

As the Shinda Sekai Sensen (SSS) continue their vindictive rebellion against God, their leader, Yuri Nakamura, comes up with an ingenious plan to escape the afterlife. Her subordinates prepare to carry out "Operation High Tension Syndrome" to deceive Kanade Tachibana, student council president and alleged associate of God, into thinking that they are ready to pass on. With a week's worth of food on the line and with Heaven as the ultimate prize, will the SSS members be able to fool the inscrutable Kanade? [Written by MAL Rewrite]

The limited-edition of the 26th manga volume will include an anime adaptation of the popular special flashback chapter "Uchi ga Kita Machi" (The Town Where I Arrived). The story reveals how Haruto, Akari, and Takashi first met during childhood, and serves as a prologue to the TV anime. The 27th limited-edition manga volume will include a special anime episode produced in full cooperation with Seo Kouji. This OVA will be the animation of the end of the manga. (Volume 27 is the final volume of the long-running series.)