Mumei and the others are thrilled with a sudden pool day. However, their joy turns to horror when shadowy figures appear in the water. Sharks with plans of world domination? How can this be? With no possible escape, how will Mumei and the others cheat their way out of this new challenging test?
"He who rules the summer rules his exams."
"من يسيطر على الصيف يسيطر على امتحاناته"
„Wer den Sommer beherrscht,
beherrscht die Prüfungen.“
"El que gobierna el verano,
gobierna los exámenes".
"Quien domina el verano,
domina los exámenes".
Qui veut profiter de l’été
le passe à étudier.
"Chi è in grado di dominare l'estate,
 domina anche gli esami."
"Quem domina o verão, domina seus testes."