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...
What? You want me to follow you?
ماذا؟ تريدنا أن نتبعك؟
Eh? Vuoi che ti seguiamo?
Hã? Querem que a gente te siga?
Что? Плыть за тобой?