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...
Nao-chan!
!ناو-تشان
Nao-chan!
¡Nao!
¡Nao!
– Ah !
– Nao !
Nao-chan!
Nao-chan!
Нао!