After their triumphant victory over Shiratorizawa Academy, the Karasuno High School volleyball team has earned their long-awaited ticket to nationals. As preparations begin, genius setter Tobio Kageyama is invited to the All-Japan Youth Training Camp to play alongside fellow nationally recognized players. Meanwhile, Kei Tsukishima is invited to a special rookie training camp for first-years within the Miyagi Prefecture. Not receiving any invitations himself, the enthusiastic Shouyou Hinata feels left behind. However, Hinata does not back down. Transforming his frustration into self-motivation, he boldly decides to sneak himself into the same rookie training camp as Tsukishima. Even though Hinata only lands himself a job as the ball boy, he comes to see this as a golden opportunity. He begins to not only reflect on his skills as a volleyball player but also analyze the plethora of information available on the court and how he can apply it. As the much-anticipated national tournament approaches, the members of Karasuno's volleyball team attempt to overcome their weak points and refine their skills, all while aiming for the top!

Dismissed as a hopeless loser by those around him, 27-year-old Arata Kaizaki bounces around from one job to another after quitting his first company. His unremarkable existence takes a sharp turn when he meets Ryou Yoake, a member of the ReLife Research Institute, who offers Arata the opportunity to change his life for the better with the help of a mysterious pill. Taking it without a second thought, Arata awakens the next day to find that his appearance has reverted to that of a 17-year-old. Arata soon learns that he is now the subject of a unique experiment and must attend high school as a transfer student for one year. Though he initially believes it will be a cinch due to his superior life experience, Arata is proven horribly wrong on his first day: he flunks all his tests, is completely out of shape, and can't keep up with the new school policies that have cropped up in the last 10 years. Furthermore, Ryou has been assigned to observe him, bringing Arata endless annoyance. ReLIFE follows Arata's struggle to adjust to his hectic new lifestyle and avoid repeating his past mistakes, all while slowly discovering more about his fellow classmates.

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 Tetsuya Kuroko and Taiga 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?

A fresh high school year always means much to come, and one of those things is joining a club. Being in a dilemma about which club to join, Yui Hirasawa stumbles upon and applies for the Light Music Club, which she misinterprets to be about playing simple instruments, such as castanets. Unable to play an instrument, she decides to visit to apologize and quit. Meanwhile, the Light Music Club faces disbandment due to a lack of members. This causes the club members to offer anything, from food to slacking off during club time, in order to convince Yui to join. Despite their efforts, Yui insists on leaving due to her lack of musical experience. As a last resort, they play a piece for Yui, which sparks her fiery passion and finally convinces her to join the club. From then onward, it is just plain messing around with bits and pieces of practice. The members of the Light Music Club are ready to make their time together a delightful one!