A strange light vibrated through the sky of Japan. All of a sudden, a yellow-haired muscular man was found lying unconscious in a desolate alley. This man was none other than the legendary Saiyan warrior Goku from the Dragon Ball universe.

As Goku was slowly regaining his consciousness, he was found by Izuku Midoriya, the protagonist of the My Hero Academia universe. Izuku was shocked to see this unfamiliar character appear in his world.

Goku, being new to this universe, was curious about the way it functioned. He was amazed by how almost everyone was born with a "quirk," something equivalent to superpowers back in his universe.

Goku fell in love with this idea and it sparked his adventurous spirit. He was thrilled to learn about these quirks and how they were different from his Saiyan powers.

Midoriya, being a huge fanboy of superheroes, was fascinated by Goku's abilities. The Saiyan's power level was something Midoriya had never witnessed before.

As intrigued as Midoriya was, his mentor, All Might, was even more so. Seeing Goku's power level brought back memories of his prime days. He wished to spar with Goku to evaluate his strength.

Goku, being an avid fighter, instantly agreed to All Might's proposal. They went to an abandoned warehouse to ensure no collateral damage.

The fight was groundbreaking, with both fighters on par with each other. It was a sight to behold, the mighty Saiyan matching blows with the Symbol of Peace.

As the fight proceeded, All Might began to understand Goku's true potential. He saw that Goku was not only physically strong, but his willpower was unparalleled.

All Might was so impressed by Goku's strength and determination that he proposed Goku to teach at U.A. High School.

Goku was initially skeptical about the idea of teaching. He saw himself more as a warrior than a mentor. But after some convincing from both All Might and Midoriya, he agreed.

Goku's journey as a teacher was as exciting as his battles. He learned more about the students' quirks and how uniquely different each was from his Saiyan abilities.

He taught the students about Ki, his source of power. He explained how using it brought about his transformations and escalated his strength to another level.

The students were in awe with Goku's lessons. They worked hard to understand the concept of Ki and tried to incorporate it into their training.

While Goku was busy teaching, the notorious villains of the MHA universe learned about his existence and sensed his massive power.

The villains, driven by their lust for power, decided to steal Goku's abilities. They planned an attack on U.A. High School to kidnap Goku.

The attack was sudden and brutal. Despite the school's strong defence, the villains successfully infiltrated the school.

Goku sensed the danger and prepared for battle. He told the students to evacuate while he dealt with the villains.

The fight was intense. Goku, even in his base form, posed a great challenge for the villains. However, their sheer numbers started to wear him down.

Seeing Goku struggle, Midoriya, inspired by Goku's bravery, stepped in along with his fellow classmates. They decided to protect their beloved teacher.

The students, empowered by Goku's teachings, stood firm against the villains. They used their quirks and Goku's lessons about Ki to their advantage.

The combined strength of Goku and the students forced the villains to retreat. Their plan to kidnap Goku had utterly failed.

Post the battle, Goku was praised by both the students and faculty for his courage and strength. His journey in the MHA universe had made him a beloved figure.

Goku's departure was as sudden as his arrival. With a bright flash, Goku was pulled back into his own universe.

The students, especially Midoriya, missed Goku immensely. However, they were thankful for the lessons Goku taught them.

The MHA universe moved forward, with Goku being a part of its history. The students continued their journey to becoming heroes, carrying Goku's teachings with them.

Meanwhile, back in the Dragon Ball universe, Goku found himself in a curious situation. Surrounded by his friends, he had a mischievous grin, already planning his next adventure.