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...
Why do you know all this stuff?
تعرفين حتّى تلك الأشياء؟
Woher weißt du das alles?
Tu sais même ce genre de choses ?
Sai persino questo?
Como você sabe de tudo isso?
Откуда ты всё это знаешь?