Its a nice special. Explaining what happened in Season 1. Its really usefull to get a quick one episode reminder of all the things that happened in season 1 if it has been a pretty long time since you watched the first season of nanatsu no taizai i really recommend you watch this. But if you have seen Season 1 recently it might be a bit boring. Overall pretty good to begin watching season 2 so that you are back at knowing the story 100%(Extra Text Because My Review isn't long enough)
(Still isnt long enough god damnit)
(how long do reviews need to be? holy sh*t)