Two episodes bundled with the special edition of volume 8, which is exactly the right dosage. Hyakushou Kizoku doesn't build to anything, it just keeps handing you Hokkaido farm life at the speed a farm actually moves: cows that don't care about your schedule, bears you genuinely have to plan around, squirrels that win. Arakawa narrating seven years of pre-Fullmetal labor while drawing herself as a cow is both the joke and the thesis, and she earned every gag by getting up at an hour you would refuse. No arcs, no stakes, no heavy themes, just "if they have no water, then let them drink milk" delivered deadpan and moving on. If the TV shorts made you laugh and then quietly respect farmers, this is the encore, and it's aimed squarely at the people who bought the book.
Two OVA episodes accompany Hyakushou Kizoku, packaged on a special DVD that came with a special edition of the manga's eighth volume. The franchise draws on the seven years Hiromu Arakawa, the creator of Fullmetal Alchemist, spent farming in Hokkaido before she became a manga author. She raised cows, grew vegetables, lived in fear of bears and was pushed around by squirrels, all through long days of work with no breaks. These extras stay in the comedy and slice of life mold of the main series.