This anime re-tells the story of the main anime from another perspective. That's what they advertised in the description. Hitori Gotoh little sister acts more like the narrator in here. Which kind of misleading because its not entirely from her perspective. Like how does she know an event occures when she's not there and also she's able to comment on it too. There's no new content either except Futari drawing which is cute. I didn't expect something big tho because it is literally just a recap. It actually helps me a bit when I try to review the main anime, makes me remember becausr Iam quite forgetful. But should you watch this? Depends. This can be a good refresher when the 2nd season came, but other than that, maybe not. Because the recap just stop at episode 11. So you can't really experience all the story either if you somehow don't watch the main series (why didn't you watch the main series?).