In order to fully enjoy the summer heat, the family nekos decide to head to the beach to have fun. However, due to their recent growths in their routine check-ups and measurements, as well as Cacao needing a suit, they all decide to go swimsuit shopping. They pick out a suit for the kitten, as well as buy her a large inflatable tuna to play with. They all arrive at the beach, Shigure and Kashou included, and enjoy their fun in the sun. Suddenly, while everyone is relaxing, Cacao is found riding her inflatable tuna and appears to be drifting out to sea...