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Acolytus:
Of course, that is the case.
After all where else could they find a clue on how to fight the demons other than on a BEACH?
There could be some ancient magical relic that is wahed ashore from the sea after all that will give them a clue of weakness of demons or maybe how to turn demons back into humans.
So they must definitely go to the BEACH - no questions asked!
??
Well, let us look at it positively.
If the author uses the nonsensical stalling filler episodes right now then he cannot stall for time with them in the future when the demons and Shin's group are about to have their real showdown.