Before U.A. High School, Izuku Midoriya and Katsuki Bakugo shared a classroom at this unremarkable middle school in Musutafu. It turns up in the franchise's very first chapter and its very first episode, and it had never placed a graduate in the hero course until those two.
Aldera Junior High, written 折寺中学校 and read Orudera Chūgakkō, stands in Musutafu, Japan. Both the opening chapter of the manga and the opening episode of the anime spend time inside it.
Its name uses ateji, characters picked so the result looks and sounds like a native Japanese place name rather than for what they mean; the pair chosen translate as "fold" and "temple". The reading also lands close to how Japanese speakers say Alderaan, the world from Star Wars.
The school is the last stop before U.A. High School for Izuku Midoriya and Katsuki Bakugo, who attend it until they sit the entrance exams. Distance was never the obstacle: Aldera shares a city with the country's most famous hero course, yet in all its years it had never sent a single student there. The two boys were the first it ever placed.

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Aldera Junior High is a middle school in Musutafu, Japan that Izuku Midoriya and Katsuki Bakugo attend before enrolling at U.A. High School. It appears in the very first chapter of the manga and the very first episode of the anime.
Aldera Junior High's Japanese name uses ateji, characters picked to sound like a native place name rather than for their literal meaning, translating loosely as fold and temple. Its reading also lands close to how Japanese speakers say Alderaan, the planet from Star Wars.
Aldera Junior High's known students are Izuku Midoriya, Katsuki Bakugo, and Tsubasa, all listed as former students. Izuku and Katsuki attend until they sit U.A. High School's entrance exams.
No, Aldera Junior High shares a city with U.A. High School yet had never placed a single student there until Izuku Midoriya and Katsuki Bakugo. The two boys were the first graduates the school ever sent to the country's most famous hero course.
Aldera Junior High first appears in Chapter 1 of the My Hero Academia manga and Episode 1 of the anime.
Looking for more on Aldera Junior High? The Dragon Ball Wiki on Fandom has a dedicated page with community notes.
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