Tomoki Sakai is your average junior-high student. Fascinated by the diving skills of Yōichi Fujitani, an elite athlete born into a family of former Olympic divers, Tomoki joins the Mizuki Diving Club (MDC) where Yōichi trains. However, the club is in the red, and its very survival is under question. Beautiful Kayoko Asaki has just returned from the US and joins the club as a new coach, with the mission to save MDC. Her goal is for the club to produce an athlete capable of competing in the Olympics. She brings in Shibuki Okitsu, a skillful diver with a wild streak from Tsugaru. Meanwhile, Kayoko discovers that Tomoki possesses a unique ability called "diamond eyes" and inspires him to begin serious training. Tomoki, Yōichi, and Shibuki have to overcome personal problems and struggle through conflicts and setbacks in the sport to achieve their dreams.

DIVE!!

The story takes place in Japan in both 1986 and 2006. The 1986 storyline follows a gamer named Daisuke who wants to confess his feelings for Kumiko, a girl he likes — all while trying to reclaim his copy of the Famicom (NES) game Mighty Bomb Jack that he lent out. In 2006, the hapless game company manager Arino-kacho struggles to complete Mighty Bomb Jack in front of fans. The storylines of the boy who loves Famicom and the middle-aged man who loves Famicom eventually merge into one.