Swimsuit/Hotspring fanservice episode for Problem Children Are Coming From Another World, Aren't They?, oh and I suppose there's also a Gift Game and throwaway subplot about slavers just so the episode can have the tiniest amount of combat.
As per usual, INSERT YOUR NAME HERE protagonist comes up with the solution to the Gift Game halfway through the episode and only reveals it towards the end, while other party members waste their time.
Thoughts: Story? Don't worry about it, this but a fanservice episode. Animation is good. Sound is good. Characters get no further developement and are exactly the same as in the show.