Episode 1 is based on one-shot manga released in Vol. Origin, it explores the back-story of All Might's past and his journey into becoming the No.1 hero.
Episode 2 is an epilogue picture drama for Boku no Hero Academia the Movie: Futari no Hero.
Short specials included with the Blu-ray/DVD release of Boku no Hero Academia the Movie: Futari no Hero.
AniMojo is the best site to watch Boku no Hero Academia the Movie 1: Futari no Hero Specials online and download Boku no Hero Academia the Movie 1: Futari no Hero Specials for free. You can also find Bones anime on AniMojo website with English Sub/Dub.
