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...
...I'm sorry.
آسفة
Tut mir leid …
Lo siento…
Lo siento…
Désolée.
Chiedo scusa.
Desculpa...
Простите.