The hot, hot summer of Tajimi has arrived, and Himeno, Mika, Naoko, and Touko have a blast in the river trying to catch eel!
Then suddenly a kappa appears before them and takes them down to Ryūgū-jō.
Inside Ryūgū-jō, a certain person in the form of their high school self is awaiting them...
Wait, wait!
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Ha-ha … Halt mal!
¡Un momento!
¡Un momento!
Non mais oh !
Fe-Fe-Fermi tutti!
E-Espera aí!
Ми-минутку!