A slice of life of high school girls in the early summer. Shiozaki Haruno is a 17-year-old girl who loves her motor cycle, HONDA's Giorno. She lives in remote highlands and longs for a vivid life in a city. Encounters with people staying at Haruno's parents' boardinghouse encourage her to step forward to her dream.

As a child, Uta—the Red Hair Pirates' ex-musician and Monkey D. Luffy's childhood friend—promised that she would build a new era of freedom by performing joyful music for the world. Luffy and the Straw Hat Crew arrive at Uta's first ever live concert, where many fans have gathered to enjoy the diva's otherworldly singing. Due to a childhood trauma, Uta bears a deep-seated hatred for pirates; her happy reunion with Luffy is cut short when she learns that he has since become one. Luffy's refusal to change his ways results in Uta unleashing her powers on the Straw Hats. The crew soon learns that their minds have already been trapped in Uta's dream world since the beginning of the concert, while their unconscious bodies remain asleep in the real world. With time quickly running out, the Straw Hats must find a way to escape the nightmare or be trapped in Uta's dream forever.

Before Saitama became the man he is today, he trained and fought endlessly to become a hero. While every scuffle leaves his tracksuit uniform in tatters, he always has it mended for free thanks to his local tailor. One day, however, the tailor informs him that he must close up shop due to pressure from a local gang. Saitama decides to help him out—and gains something irreplaceable in the process.

Toua Tokuchi is a prodigy when it comes to both baseball and gambling. Pitching nothing but mediocre fastballs, he has made a name for himself by attaining 499 consecutive victories in the game of One Outs: a one-on-one showdown between a pitcher and a batter. Despite his remarkable abilities, however, Tokuchi sees the sport as nothing more than a way to make some quick money. When Hiromichi Kojima, a legendary hitter for the struggling Saikyou Saitama Lycaons, witnesses Tokuchi's skills firsthand, he realizes that the man might be exactly what the team needs to get out of their slump. Determined to recruit Tokuchi no matter what, Kojima places his own career on the line and defeats Tokuchi at his own specialty—One Outs. Forced to become a Lycaon, Tokuchi soon finds himself at odds with the team's owner, Tsuneo Saikawa. After Saikawa refuses to give him a reasonable salary, Tokuchi proposes a special contract: pitching an out will earn him five million yen, but giving up a run will cost him fifty million. With every game having the potential to either make or break him, Tokuchi must outwit all who stand in his way.