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Houkago Teibou Nisshi Episode 9 (Chinese Subbed)
Ep 9: 備えとアオサギ - Preparations and Herons - Sonae to Aosagi
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. Source: Funimation