Series launched with Himeiden novel in 2012, inspired manga

The official Twitter account of writer NisiOisin ( Monogatari series, Medaka Box ) revealed on December 28 that his Densetsu (Legend) series of novels will end with the 10th volume. The ninth volume, Hikyūden , is slated for February 28, while the 10th volume, Hijūden , is slated for March 28.

In the story of the series' first novel, an event that produced a high-frequency sound known as the "Great Scream" occurred worldwide on October 25, 2012 at 7:32 a.m. The event lasted only 23 seconds, but it slew around 2.3 billion people, about a third of the world's population. Half a year later, a 13-year-old boy named Kū Sorakara goes to the Kisaragi Clinic for a checkup, as it seems he has lost the ability to feel emotion about anything. But after his checkup, a group known as the Earth Destruction Army invites him to the organization. The group tells Kū that they want him to be a hero who will fight the wicked Earth, which is trying to destroy mankind.

The series began with the first novel, Himeiden , in 2012. The eighth novel in the series, Hieiden , shipped in December 2016.