Water Gate Dive Imaizumi and Midousuji engage in a high-risk downhill battle in the sudden rain. Meanwhile, Sakamichi does his best to catch up to Imaizumi while struggling with the unfamiliar rainy downhill. While competing fiercely for first, Imaizumi and Midousuji charge into a giant puddle that will determine their race! Imaizumi, who has awakened as Sohoku's ace, pushes past his limits, and unable to seize victory, Midousuji falls behind and collapses on the rainy sidewalk...