We open on a young girl lost in a phantasmagoric land of human-sized cats. A friendly-seeming one recognizes her distress and offers help.
Twitter's trending infobox suggests that the vaccine provides stronger immunity than recovery.
I have no idea what model suggests this. It doesn't make any sense to me.
This is one of the few media that address the question: If God exists, why is there suffering, without deciding on either Theodicy (God has a reason and it's X/Y/unknowable) or Maltheism (God is evil and must be defeated.)
I was hoping that the OVAs would be character focused episodes. We got a couple of those throughout the series and I think they were a high point. I think the pacing might have been better served if the show was slightly longer. 15-18 episodes, say. Sadly, the OVAs don't do that.
Given that Otonashi is Tachibana's donor, but Tachibana arrived first, I think we can assume the Jeremy Bearimy timeline rule from _The Good Place_ is in effect.
I enjoyed the running gag of Otonashi and Hinata asking each other if they were gay* whenever they did something caring for each other. It seemed very high school.
* the subs have it as "are you that way".
This show has a much larger cast than most 13 episode shows. It doesn't feel excessively crowded though. I wonder if it's just that they give relatively minor characters billing in the opener or what.
I mentioned the Bodhisattva vow earlier, and I think that's a big hidden driver. Tachibana is basically already complete at the start, but she stays to help others.
Not very effectively, but hey.
Many of the characters have back stories that would make them at home in the Monogatari series, or even worse. These kids are carrying a lot of trauma, and some of it can't ever really be solved. Only accepted.