See, I think the only thing that made this OVA not have a 10 is that it's... kinda short? It's still 20 minutes long, but I feel like there's so much MORE that could happen here! Honestly, this plot could go on for 3 more episodes if the creators wanted to :P I loved the focus on Tsuyu and her friend, I loved the rival academy's students and their quirks (and one quirk in special!), I loved how All Might was pretty much IGNORED by the zombies (lol) and so on. So, yeah, my only complaint was that it could have gone for much longer than just20 minutes. And it could easily be part of the canon storyline.