I love Kasen's pose when she's reacting to Kanako's explanation.
It's the same as her "Wait, isn't this 'arm' just a prank?" pose.
Maybe tomorrow, or maybe the very next second...This scenario...When will it happen?It will not be a surprise of when it will happen...Quickly think of a solution!What are the Kappa doing?What!? This is too perilous!The Kappa and their bases are all beneath the dam...