Chaika - The Coffin Princess S02 E06 The Castle of Madness

In Goeranson, the capital of the Principality of Hartgen, fierce fighters from all over the world gather for a "festival." The principality's king is one of the eight heroes and the captain of the force that subjugated Emperor Gaz, the man who cut off the emperor's head himself: King Stephan Hartgen.