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...
Kukuri of the Strange River
كوكوري النهر الغريب
Kukuri vom rätselhaften Fluss
MIKA DE L’ÉTRANGE RIVIÈRE
Kukuri del fiume misterioso
Kukuri do Rio Misterioso
Кукури из странной реки