Greatest Demon Lord Is Reborn as a Typical Nobody, Vol. 8 (light novel)

In the transformed world, Demon Lord Ard squares off against Alvarto, mightiest of the Four Heavenly Kings. Yet, just as their fated showdown nears a brutal, tragic conclusion, the voice of someone dear to Ard sounds across the battlefield! The saga of the Demon Lord versus the Four Heavenly Kings is reaching its climax, but who will be left standing?