Boku no Hero Academia: All Might Rising - The Animation

Included in the "Plus Ultra" version of the Blu-ray/DVD release of "Boku no Hero Academia the Movie: Futari no Hero" (My Hero Academia the Movie: Two Heroes)
Anime short telling the story of All Might and Nana, and how All Might became "All Might!"
[Source: ☆オードリーAudrey☆]