The Greatest Demon Lord Is Reborn as a Typical Nobody, Vol. 7 (light novel): Clown of the Outer Gods

A rescue mission against all odds? Racing through the city-a familiar landscape turned unrecognizable, devastated by magic and violence-Ard and his friends attempt to save Ireena from one of the Four Heavenly Kings, Lizer. After surviving back-to-back fights against the enemy, the heroes spot a single path forward to rescue their friend and save the world... But things turn from bad to worse when they run into Mephisto, an impossibly malicious character and the archnemesis of the Demon Lord...