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...
A raised point on which the high 
ranking persons would sit.
طبقة مرتفعة يجلس عليها رفيعو المقام
Un punto rialzato in cui siedono
le persone di rango più alto.
É num patamar elevado
para que nobres se sentem.
Площадка, на которой
сидят высокопоставленные люди.