"My Hero Academia the Movie -Heroes: Rising-" is set in the universe of the popular shonen series "My Hero Academia," featuring Class 1-A of U.A. High School. The story takes place during the students' provisional hero license training, where they are assigned to a remote island called Nabu Island to assist its residents as part of their work-study program. The island is peaceful, and the students engage in various community service tasks, honing their skills while helping the locals.

The tranquility is disrupted when a powerful villain named Nine, who possesses the ability to steal and combine multiple Quirks, arrives on the island with his team. Nine seeks a specific Quirk to achieve his goal of creating a new world order where only the strongest survive. His presence poses a significant threat to both the islanders and the students, forcing Class 1-A to step up as heroes despite their inexperience.

As the conflict escalates, Deku (Izuku Midoriya) and Bakugo (Katsuki Bakugo) take center stage. The two rivals must set aside their differences and work together to protect the island and its inhabitants. In a climactic battle, Deku temporarily shares his Quirk, One For All, with Bakugo, allowing them to combine their strengths and face Nine in an intense showdown. The fight pushes both characters to their limits, showcasing their growth and determination.

The narrative emphasizes themes of heroism, teamwork, and sacrifice, as the students grapple with the responsibility of protecting others while confronting their own limitations. The film also explores the bond between Deku and Bakugo, highlighting their complex relationship and mutual respect as they strive to embody the ideals of heroism. Supporting characters from Class 1-A contribute to the story, each playing a role in the defense of Nabu Island and the battle against Nine's forces.

The movie concludes with the students successfully defending the island and returning to their training, having gained valuable experience and strengthened their resolve as future heroes. The events of the film are designed to fit within the broader timeline of the series, offering a self-contained story that complements the main narrative while delivering high-stakes action and character development.