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...
an even grander version of 
Taiyū-in's Koukamon in Nikko!
!أكثر فخامة من كوكامون تايو إين في نيكّو
uma versão ainda mais pomposa
do Taiyuu-in Koukamon, de Nikko!
напоминает торжественную версию
храма Тайюин Кокамона в Никко!