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...
Mika-chan, did you forget what day it is?
ميكا-تشان، أنسيتِ أيّ يومٍ هذا؟
Mika-chan, hast du etwa vergessen,
welcher Tag heute ist?
Mika, ¿acaso olvidaste que día es hoy?
Mika, ¿acaso has olvidado
que día es hoy?
Tu as oublié quel jour on est, Mika ?
Mika-chan, hai scordato che giorno è oggi?
Mika-chan, já se esqueceu
de que dia é hoje?
Мика, ты забыла,
что сегодня за день?