I've just found about this series and watched the episodes.. I really enjoyed the specials.. They are short but cute.. They have random stories in each episodes and that's what makes them enjoyable I really like the characters of Owari no Seraph... I'm glad to see more of them.. I'm giving my overall rating 7 because I wanted to see more of Mikaela Hyakuya... So ratings for Story- 7random short stories are always fun to watch,

Art-7

I get the art was cheaply made.. but still looked good for me,

Sound-8

I always like the sound of this anime.. so still felt good

Character-9

Well, as the characters matter.. as I said previously I really like them that's why characters are great

Enjoyment-9

I binge-watch the show and enjoyed it ....