If you take certain aspects of Zootopia and paste it with certain aspects of Owari no Seraph, you will kind of get the main story of BNA. But thats a good thing, because Zootopia and Owari no Seraph are one of my favs & have rewatched each multiple times. Its probaby why i liked BNA as well, other than the fantastic animation and art and colours. Its an enjoyable anime overall but doesnt go in too deep. Rather straight forward. My fav has to be Oogami. He is what gives BNA the "hot" aspect :3 Also i think they should have been a throuple. Isaid what i said.