Kitagawa Riko, a member of the water polo club, engages in sex with her boyfriend the night before a big match—still wearing her official competition swimsuit. Her voluptuous, alluring figure stands out as her boyfriend becomes wildly excited by her appearance. Without removing her swimsuit, he gives in to raw, unfiltered desire, driven purely by intense lust. Amid the world of water polo, their passionate encounter unfolds in a captivating display of heat and emotion.