Yuusha, Yamemasu: Kenshuu Ryokou wa Mokuteki wo Miushinau na

Leo takes Echidna and the Four Great Generals on a training trip to a shabby hot-spring inn, insisting that even an excursion should remain a learning opportunity. The unsettling landlady and the inn's peculiar atmosphere make relaxation difficult, but the real trouble begins during the group's evening gathering when Echidna suddenly disappears.

The mystery deepens as members of the party begin vanishing one after another. Leo, Shutina, and the returned Echidna are left to search for the missing generals and unravel what is happening around the inn, all while trying not to lose sight of the practical goal that supposedly brought them on the trip in the first place.