Seraph of the End: Guren Ichinose: Catastrophe at Sixteen (Manga)

Seraph of the End: Guren Ichinose: Catastrophe at Sixteen (終わりのセラフ 一瀬グレン、16歳の破滅) is the manga adaptation of the light novel series of the same name, written by Takaya Kagami and illustrated by Yo Asami.

It was first serialized by in  on June 6, 2017, and ended on February 4, 2022. The manga completed in its twelfth volume in March 2022.

This is a prequel series that takes place eight years before the events of Seraph of the End: Vampire Reign, though both manga were published concurrently.

Plot
This is the story before the world came to an end. Guren Ichinose, a sixteen-year-old, enters the magical teacher training school, First Shibuya High. What he was waiting for was suppression from the Hīragi Family who leads the overwhelming sorcerer organization Order of the Imperial Demons, and a reunion with a girl who gathered her thoughts on a young age – against the fate "School magical fantasy", start!

Chapters and Volumes
Chapters are first released individually, before published together with other chapters within volumes at a later date.