Death March to the Parallel World Rhapsody, Vol. 6 (light novel) (Death March to the Parallel World Rhapsody (light novel))
After their journey down the river, Satou and crew finally arrive at the old capital just in time for the martial arts tournament, along with some fireworks, a ball at the castle, and sightseeing in the Ougoch Duchy. But the followers of the demon lord are plotting in the shadows...