Board Thread:Questions and Answers/@comment-93.87.198.81-20151226152246/@comment-25942629-20160202114459

The author didn't write the anime script, but he was used as a reference for it. He gave them the ending of the Nagoya arc. If the anime did the fighting scenes well and sensibly, that would've been great to look forward to. However, they did illogical things like making seraph!Yu attack Crowley, a vampire, when the angels have absolutely zero interest in vampires. They changed a lot at the end, too. When Mika should have become drastically stronger from drinking human blood and turning into a true vampire, the anime made him weaker. He kept getting beat up and injured as well when it was the other way around in the manga, and he was protecting Yu. The anime really messed up Mika's character.