Tomoki Sakai (Kento Hayashi) is a typical junior. Tomoki joins the Mizuki Diving Club (MDC) where Yoichi Fujitani (Sosuke Ikemaytsu) trains. But the club is in the red, and its survival is in doubt. Kayoko Asaki (Asaka Seto) returns from the US to save MDC as a new coach. Her ambition is for the club to produce an Olympian. She invites Shibuki Okitsu (Junpei Mizobata), a wild diver from Tsugaru. Kayoko discovers Tomoki's special talent, "diamond eyes," and encourages him to train hard. To reach their goals, Tomoki, Yoichi, and Shibuki must overcome personal challenges and overcome obstacles in sports.