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 high ranking person in 
Ryūgū-jō would be...
...الشخص رفيع المقام في ريوغو جو
La noble de la leyenda
del dios dragón es…
La noble de la leyenda
del dios dragón es…
Une personne de haut rang
dans le palais de Ryûgû.
La persona di rango più alto nel Ryūgū-jō è...
Uma pessoa nobre, no
Castelo Ryuuguu, deve ser...
Высокопоставленный
человек в подводном замке...