Seraph of the End manga volume 20 features story by Takaya Kagami and Daisuke Furuya with art by Yamato Yamamoto.

The Hyakuya Sect descends on the Demon Army as the First Progenitor, Sika Madu, takes over Shinoa's mind and body. Leading the invasion is none other than Second Progenitor Rígr Stafford, and he's after Yuichiro, who is once again on the run with Mika. Meanwhile, Guren and Mahiru enact their long-awaited plan, allowing the second demon inside Guren, Noya, to possess him. It's an all-out war between vampires, humans and demons!