How NOT to Summon a Demon Lord manga volume 22 features story by Yukiya Murasaki with art by Naoto Fukuda.

The Demon Overlord Modinaram has awakened! The people of Faltra cower and fall into despair when even the combined might of the city's defenders fails to best Modinaram, who has absorbed the powers of multiple Demon Lords. Diablo races to the scene--will he be able to bring an end to the war between the Fallen and the mortal races?