As Goma-chan is swimming in the river, a shark's silhouette appears behind him?! The shark turns out to be Dot-chan, a young whale shark that escaped from the local aquarium! Goma-chan and Dot-chan quickly become great friends and have fun swimming in Dot-chan's tank at the aquarium together. But when Ashibe-kun calls out to Goma-chan that it's time to go home, Goma-chan doesn't seem to understand him... What's happened to Goma-chan?
I wonder why...
...أتساءل
Wieso nur?
No sé por qué, 
pero creo que no me entendía.
No sé por qué,
pero creo que no me entendía.
et pourquoi il ne comprenait pas
quand je lui parlais.
Chissà come mai...
Por que será?
Мне кажется...