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?
For that reason, it has been decided 
that today will be a pool day!
لذا، قُرِّر أن يكون هذا اليوم يوم مسبح
Por eso, decidimos
que hoy irán a la piscina.
Por eso decidimos
que hoy iréis a la piscina.
C’est pour ça qu’aujourd’hui,
c’est journée piscine !
Per questo, dichiaro che la giornata di oggi
sarà il giorno della piscina!
E é por isso que, hoje, decidi
 ter um dia na piscina!