Boku No Hero Academia Season 1 Episode 1 detailed description :-
Some time ago, a younger Izuku Midoriya stands up to Katsuki Bakugo in order to defend another child from being bullied. Katsuki doesn’t take “Deku” seriously and mocks him for being Quirkless and attempting to play hero. Back to present time, a now 14-year-old Izuku watches as Heroes battle an enormous villain.
One day long ago in Quig Quig, China, a luminescent baby was born with a unique power. Then, as time passed, the similar phenomena happened all over the world, and soon the majority of the population had obtained superhuman powers—known as “Quirks”. Due to that, people were able to pursue heroism as a profession.As Backdraft keeps citizens at a safe distance, Kamui Woods battles the gigantic criminal. Kamui Woods states that the villain used his Quirk for illegal purposes, and uses Lacquered Chains Prison on him in an attempt to stop his movement.
However, Mt. Lady shows up and uses Canyon Cannon to defeat him. Several people start photographing the heroine as she declares that today is her debut and asks for the rest to be left up to her. Izuku starts rapidly taking notes about Mt. Lady’s Quirk, Gigantification. A man wonders if he’s aiming to be a hero, wishing him good luck, to which Izuku happily answers that he’ll do his best.
At Aldera Junior High, a teacher lectures the class about considering their futures. He says he will hand out the printouts on the students’ desired life-course, but knows they all want to be heroes. As the class starts using their Quirks, he reminds them they’re not allowed to use them during school hours.
Katsuki tells the teacher not to group him with everyone else because he’s superior. His classmates yell at him for that, but Katsuki tells them to shut up, and they remember he’s aiming for U.A. High School. As the students comment about the difficulty of the exam, Katsuki declares he aced the mock exam and intends to surpass even All Might as the top hero. The teacher mentions that Izuku also wants to go to U.A. The whole class then turns to face Izuku, erupting in laughter moments later.