Even though it has been a year since the Iwatobi High School Swim Club has been created, new members have yet to join the club. Now that Haruka Nanase and Makoto Tachibana are senior students, along with their younger friends Nagisa Hazuki and Rei Ryuugazaki, they have to find a way to attract new members. If not, the club will be forced to close the following year due to a lack of membership. Meanwhile, with impending graduation, it is also time for the seniors to decide their plans for the future. Unlike their friend Rin Matsuoka, the new captain of Samezuka Academy Swim Club who is determined to fulfill his dream of being a professional swimmer, Haruka and Makoto are unsure about what career path they want to take. Further problems arise when an old friend of Rin's, Sousuke Yamazaki, comes to the city to study at Samezuka Academy; the recently scouted swimmer's arrival causes tension in the relationship among him, Rin, and Haruka. [Written by MAL Rewrite]

With the Interhigh Championship finally over, Seirin's basketball team refocuses their efforts, training harder than ever to get the chance to participate in the Winter Cup. Both Kuroko and Kagami see old friends walk back into their lives, providing a challenge both on and off the court. As new skills are developed and new alliances created, enemies from various teams—giants of high school basketball such as Yousen, Shuutoku and Touou—stand in the way of Seirin's steadfast attempts to get to the top. All of these schools prove to be formidable foes whose abilities progress exponentially, while Kuroko struggles to find a balance between his resolve to play as part of a team and his desire to win. With old wounds reopening, new challenges to face on the court, and a new set of foes—the "Uncrowned Kings"—vowing to defeat the new hopefuls, will Seirin ever be able to achieve their dream of beating the Generation of Miracles? [Written by MAL Rewrite]

Hanamichi Sakuragi, infamous for his temper, massive height, and fire-red hair, enrolls in Shohoku High, hoping to finally get a girlfriend and break his record of being rejected 50 consecutive times in middle school. His notoriety precedes him, however, leading to him being avoided by most students. Soon, after certain events, Hanamichi is left with two unwavering thoughts: "I hate basketball," and "I desperately need a girlfriend." One day, a girl named Haruko Akagi approaches him without any knowledge of his troublemaking ways and asks him if he likes basketball. Hanamichi immediately falls head over heels in love with her, blurting out a fervent affirmative. She then leads him to the gymnasium, where she asks him if he can do a slam dunk. In an attempt to impress Haruko, he makes the leap, but overshoots, instead slamming his head straight into the blackboard. When Haruko informs the basketball team's captain of Hanamichi's near-inhuman physical capabilities, he slowly finds himself drawn into the camaraderie and competition of the sport he had previously held resentment for. [Written by MAL Rewrite]