The seemingly unimpressive Saitama has a rather unique hobby: being a hero. In order to pursue his childhood dream, Saitama relentlessly trained for three years, losing all of his hair in the process. Now, Saitama is so powerful, he can defeat any enemy with just one punch. However, having no one capable of matching his strength has led Saitama to an unexpected problem—he is no longer able to enjoy the thrill of battling and has become quite bored. One day, Saitama catches the attention of 19-year-old cyborg Genos, who witnesses his power and wishes to become Saitama's disciple. Genos proposes that the two join the Hero Association in order to become certified heroes that will be recognized for their positive contributions to society. Saitama, who is shocked that no one knows who he is, quickly agrees. Meeting new allies and taking on new foes, Saitama embarks on a new journey as a member of the Hero Association to experience the excitement of battle he once felt.

Moments before Naruto Uzumaki's birth, a huge demon known as the Nine-Tailed Fox attacked Konohagakure, the Hidden Leaf Village, and wreaked havoc. In order to put an end to the demon's rampage, the leader of the village, the Fourth Hokage, sacrificed his life and sealed the monstrous beast inside the newborn Naruto. In the present, Naruto is a hyperactive and knuckle-headed ninja growing up within Konohagakure. Shunned because of the demon inside him, Naruto struggles to find his place in the village. His one burning desire to become the Hokage and be acknowledged by the villagers who despise him. However, while his goal leads him to unbreakable bonds with lifelong friends, it also lands him in the crosshairs of many deadly foes.

Hunters devote themselves to accomplishing hazardous tasks, all from traversing the world's uncharted territories to locating rare items and monsters. Before becoming a Hunter, one must pass the Hunter Examination—a high-risk selection process in which most applicants end up handicapped or worse, deceased. Ambitious participants who challenge the notorious exam carry their own reason. What drives 12-year-old Gon Freecss is finding Ging, his father and a Hunter himself. Believing that he will meet his father by becoming a Hunter, Gon takes the first step to walk the same path. During the Hunter Examination, Gon befriends the medical student Leorio Paladiknight, the vindictive Kurapika, and ex-assassin Killua Zoldyck. While their motives vastly differ from each other, they band together for a common goal and begin to venture into a perilous world.

Idly indulging in baseless paranormal activities with the Occult Club, high schooler Yuuji Itadori spends his days at either the clubroom or the hospital, where he visits his bedridden grandfather. However, this leisurely lifestyle soon takes a turn for the strange when he unknowingly encounters a cursed item. Triggering a chain of supernatural occurrences, Yuuji finds himself suddenly thrust into the world of Curses—dreadful beings formed from human malice and negativity—after swallowing the said item, revealed to be a finger belonging to the demon Sukuna Ryoumen, the King of Curses. Yuuji experiences first-hand the threat these Curses pose to society as he discovers his own newfound powers. Introduced to the Tokyo Prefectural Jujutsu High School, he begins to walk down a path from which he cannot return—the path of a Jujutsu sorcerer.