It's produced by a different studio so it looks quite different - especially the characters. Animation's quite rough. It kind of fits in but also kind of doesn't considering the atmosphere because in the TV series it felt like a trusting bond was finally forged but then here, it suggests there's still some insecurity.
You won't be missing much if you didn't watch this but it might be worth a watch if you want to see some expansion on how the supporting characters ended up the way they did in the last episode of the TV series.
