Prizmmy and Puretty are assigned to perform a Prism Show at an island resort, which will also include a synchronized swimming routine. However, Hye-in, Shi-yoon, and Jae-eun do not know how to swim, so Prizmmy teaches them. Meanwhile, So-min is reluctant to swim because of childhood trauma. With Yun-su and the other Puretty members' support, Puretty successfully performs the Prism Show, with So-min performing the Prism Jump "Pink Dolphin Venus".