The girls in the Breakwater Club learn how to float properly just in case they ever fall into the ocean. Later on, Hina goes to battle with a heron, but then notices it has a fishing line tangled around its leg.
This yellow part is the flotation device.
.هذا الجزء الأصفر هو جهاز الطفو
Das Gelbe hier ist die Schwimmblase.
La parte amarilla es el flotador.
Ce sac jaune est la bouée.
Essa parte amarela é a boia.