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...
The person in last place gets a punishment!
!المركز الأخير ينال عقاباً
L'ultima farà una penitenza!
Quem ficar em último será punida!
Проигравшему будет наказание!