Shiro to Kiiro (EP4) (Patreon)

Nami loves dolphins ever since she saw one at an aquarium with her father when she was a child, and she is looking forward to the day when she can swim with them. However, Mizuho loses her precious necklace, and while everyone is searching for it, the reservation time for the swim with the dolphins' schedule has passed. That night, Takuma takes the three of them to a recommended pancake store, Eggs 'n Things, but the store is closed. For some reason, something was holding back Nami.