Death March to the Parallel World Rhapsody, Vol. 13 (manga)

Satou and his companions have arrived in Gururian City, and all around them, mock battles are a common sight in preparation for the upcoming martial arts tournament.
Meanwhile, the Wings of Freedom, a demon lord–worshiping cult, is giving speeches in the streets, and sure enough, a horde of demons soon emerges from within the city!
Amid the chaos, Satou and friends rush to the scene, only to find an unexpected guest…