As always...of course the Kappa would transform a weather phenomenon (the Genbu revine being flooded and the kappa hideout not even being visible under the water) ...into a business...!
And a creative one at that..it does look fun to just let the currents of the water guide your body! Unless you crash and...get down under da water like that poor kappa at page 18!

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Interestingly, Luna got tired first (when the three were running after eavesdropping on reimu and marisa, heh), maybe her stamina isnt as great as them both.
Just like the chapter where she warned her gang to not go down the hole (in eternity's "own summer" vacation home), she was the first to warn them that it may be dangerous going to the genbu ravine...yet she goes anyway with them, heh.
I like her "maturity", which is a flawed one.
And nitori was willing to make a joke to scare the fairies regarding the "death" of a kappa (of Nitori's own kind basically).
Nitori is terrifying in both business and jokes.
Honorary mention: interesting that Piece cant sleep due to the heat of summer (maybe due to the abnormal weather a while back, it snowed much so the genbu ravine was flooded). Even tho she is..a Hell fairie.. uhh.. I guess she did got weaker indeed...?
....now..lets see the "test drive"..that the fairies are forced to take now....down the genbu ravine they go..!